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If I didn't have to go to class today, I would visit my friends
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
16. has lived
17. does not study
18. speaking
19. seeing
20. was built
21. moved (not sure)
22.
23. did not know
24. sent
25. did not have to
26. was playing
27.
28. stands
29.
30. help
31.
32. to recognize
B - A - D - C