32 D
33 D
34 B
35 C
36 D
37 A
38B
39 D
40 B
41 A
42 C
43 B
44 D
45 B
46 B
47 B
48 B
49 A
50 B
IV
1 go => going
2 on => bỏ
3 going => to go
4 do => to do
5 experimented => doing experiment
6 are => is
7 more easy => easier
8 for => since
9 working => work
10 with => as
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1 D
2 A
3 D
4 C
5 B
6 C
7 C
8 A
9 B
10 A
11 B
12 C
13 D
15 D
15 A
16 C
17 D
18 C
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