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4 If you aren't alert, you computer will be infected with viruses
5 If we use much pesticide on vegetables, they will become poisonous
9 Because Nam needs to improve his social skills, he attends the activity
11 How about using public buses instead of motorbike
12 They enjoy protecting the environment unpolluted
15 Mr Brown was disappointed that his son didn't write to him
1 B
2 C
3 A
4 A
5 D
6 D
7 A
8 A
9 C
10 C
11 B
12 C
13 B
14 B
15 C
16 C
17 C
18 B
19 B
20 D
21 A
22 A
23 A
24 B
25 B
26 C
27 A
28 D
29 B
30 A
31 A
32 B
33 C
34 D
35 B
9 Although the girl works hard from morning till night, her step mother isn't happy
10 Rice is grown in tropical countries
11 The countryside is more peaceful than the city, but I prefer living in the city
12 A lot of Chung Cakes are made on Tet holiday
13 Although Little Pea works hard from morning till night, her mother isn't happy
14 An ordinary car goes more slowly than a sport car
15 An's sister performs better than him
16 Many fesstivals are held by the Thai every year
17 I enjoy hanging out with my best friends
18 If you don't hurry up, you will be late for the race
If I didn't have to go to class today, I would visit my friends
12 I consider that to manage to know what other people are thinking is quite impossible
8 disappointing
12 preservation
13 seriously