IV. Put the verbs in brackets into the correct tense or form.

1. Everybody ……………… (cheer) and ………………… (sing) happily at the moment.

2. Sorry, I can’t come. I …………………………… (be) very busy tomorrow.

3. Would you like ( play) .......................football  with us this weekend?

4. Most students …………………………… (not go) to school on Saturday.

5. You must …………………………… (take) a boat ride around the island.

6. Listen! Mai( sing)……………………………….

7. My father often ( have)………………coffee for breakfast, but today he (eat)…………some eggs.

8. We should (do)…………… morning exercises regularly.

9. We (come)……………. back next month.

10. Let’s (walk)……………. to school to protect our environment.

I.Circle the word which is pronounced differently from others.

Hoàn thành các phương trình hoá học sau:
K    +​  ? ​->     KCl

?   + ​H2O -> NaOH  +   H2

MgCl2 ​+ ​AgNO3 -> ​?    +   AgCl

FexOy    +     H2    ->     Fe    +   H2O

Đồng +  bạc nitrat (Ag và nhóm NO3)  ->   đồng (II) nitrat  +  ?

Canxi cacbonat  +  axit sunfuric (H2SO4)  ->  canxi sunfat ( Ca và nhóm SO4) +   nước +  khí cacbonic

Sắt (II) nitrat ( Fe và nhóm NO3)  +  natri hidroxit ( Na và nhóm OH)  ->

      sắt (II) hidroxit  +  natri nitrat

Kali clorat (KClO3) ->   kali clorua ( K và Cl) + oxi

Oxi + cacbon  ->  khí cacbonic

Khí cacbonic  +  nước  ->  axit cacbonic (H2CO3)