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2 tháng 8 2017

1,of

2,by

3,in

4,at

5,in

6,of

7,for

8,on

11 tháng 9 2018

VI/ Fill in each gap with an appropriate preposition:

1. My class consist of thirty-five members.

2. Traditionally, the ao dai was frequently worn by men and women

3. Women usually wear the ao dai on special occasions.

4. What do you usually wear on the weekends ?

5. Jeans cloth was made in Europe.

6. Jeans cloth was made from cotton in the 18th century.

7. It is necessary for students to wear uniform.

8. Experiments on animals should be stopped.
16 tháng 8 2017

IV/ fill in the blank with an appropriate preposition

1. The Ao dai consists ......of.......a long silk tunic thatis slit on the sides and worn over loose pants

2. My sister was born........in.... 30th April 2006

3. We should travel......at....... 7 o'clock in the morning

4. Do you often spend your friends and relatives beautiful cards.......at...... Christmas

5. There are footnotes written....in........ The bottom of each page in this book

6. Try to be pleasant....with........ Everybody

16 tháng 8 2017

Mọi người giúp mình với, mình đang cần gấp, xin cảm ơn ạ

IV/ fill in the blank with an appropriate preposition

1. The Ao dai consists ......of.......a long silk tunic thatis slit on the sides and worn over loose pants

2. My sister was born......in...... 30th April 2006

3. We should travel......at....... 7 o'clock in the morning

4. Do you often spend your friends and relatives beautiful cards......at....... Christmas

5. There are footnotes written......in...... The bottom of each page in this book

6. Try to be pleasant......with...... everybody

4 tháng 8 2017

Mọi người giúp mình với, mình đang cần gấp, xin cảm ơn ạ

V/ fill in blank with an appropriate preposition

1. My brother was born ......on......September 15, 1990

2. She will be here ......from.......Monday........to.......Saturday

3. We will come to see them .....between.......7 AM and 10.30 AM

4. Mary likes watching the stars.......at....night

5. The post office will close......at......... 4.30 PM

6. The bus collected us.....at.......5 o'clock.....in........the morning

4 tháng 8 2017

V/Follow in blank without an appropriate preposition

1. My brother was born on September 15, 1990

2. She will be here on Monday and Saturday

3. We will come to see them between 7 AM and 10.30 AM

4. Mary likes watching the stars at night

5. The post office will close at 4.30 PM

6. The bus collected us at 5 o'clock in the morning

13 tháng 8 2017

IV/ fill in the blank with appropriate prepositions

1. How far did he drive ?-.......at.....30 miles an hour

2. How many chapters does this book consist.....of......?

3. Vietnam is famous.......for..... Its cultural heritages

7. I will be home ........on....... Sunday November 5

8. This brochure is full......of.....useful information

9. They still keep in touch.......with....... Each other

10. She doesn't depend......on...... Her parents

PTHH: \(Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O\)

Ta có: \(\left\{{}\begin{matrix}m_{H_2SO_4}=588\cdot5\%=29,4\left(g\right)\Rightarrow n_{H_2SO_4}=\dfrac{29,4}{98}=0,3\left(mol\right)\\n_{Al_2O_3}=\dfrac{20,4}{102}=0,2\left(mol\right)\end{matrix}\right.\)

Xét tỉ lệ: \(\dfrac{0,2}{1}>\dfrac{0,3}{3}\) \(\Rightarrow\) Al2O3 còn dư

\(\Rightarrow n_{Al_2\left(SO_4\right)_3}=0,1\left(mol\right)=n_{Al_2O_3\left(dư\right)}\)

\(\Rightarrow C\%_{Al_2\left(SO_4\right)_3}=\dfrac{0,1\cdot342}{20,4+588-0,1\cdot102}\cdot100\%\approx5,72\%\)

21 tháng 10 2021

\(d,ĐK:x\ge1\\ PT\Leftrightarrow\sqrt{x-1}=2+\sqrt{x+1}\\ \Leftrightarrow x-1=2+x+1+4\sqrt{x+1}\\ \Leftrightarrow4\sqrt{x+1}=-4\Leftrightarrow x\in\varnothing\left(4\sqrt{x+1}\ge0\right)\\ g,ĐK:x\ge\dfrac{1}{2}\\ PT\Leftrightarrow x+\sqrt{2x-1}+x-\sqrt{2x-1}+2\sqrt{\left(x+\sqrt{2x-1}\right)\left(x-\sqrt{2x-1}\right)}=2\\ \Leftrightarrow2x+2\sqrt{x^2-2x+1}=2\\ \Leftrightarrow\sqrt{\left(x-1\right)^2}=\dfrac{2-2x}{2}=1-x\\ \Leftrightarrow\left|x-1\right|=1-x\\ \Leftrightarrow\left[{}\begin{matrix}x-1=1-x\left(x\ge1\right)\\x-1=x-1\left(x< 1\right)\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=1\left(tm\right)\\x\in R\end{matrix}\right.\)

 

18 tháng 10 2021

Ha's house is small and it's in the country

18 tháng 10 2021

Ha's house is small and It's in the country

II.             Fill in the gap with an appropriate preposition ON / IN / OF / AT…. 1.                  I’m very proud ……………………..……..my parents.2.                  You should spend more time ………………………………...your English.3.                  Are you doing anything ………………………………………….New Year’s Eve?4.                  We’re living ……………………………………………the 21st century.5.                  A lion escaped ……………………..……..its cage yesterday morning.6.                  The sheep grazed peacefully...
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II.             Fill in the gap with an appropriate preposition ON / IN / OF / AT….

1.                  I’m very proud ……………………..……..my parents.

2.                  You should spend more time ………………………………...your English.

3.                  Are you doing anything ………………………………………….New Year’s Eve?

4.                  We’re living ……………………………………………the 21st century.

5.                  A lion escaped ……………………..……..its cage yesterday morning.

6.                  The sheep grazed peacefully  ………………………………..the fields.

7.                  Are you doing anything special………………………………………….Christmas Eve?

8.                  Students can use a dictionary to find …………………………………………..new words.

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13 tháng 10 2021

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29 tháng 3 2022

1. in

2. in

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6. by

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29 tháng 3 2022

1. in

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