Exercise 5 nha=) ghi nhầm
Exercise 8:
1D
2D
3C
4D
5C
6A
7C
8D
9A
10B
Exercise 7:
1D
2A
3C
4A
5C
6D
7C
8A
9B
10A
11D
12C
13D
14B
15C
Exercise 7
1D
2B
3C
4B
5D
6C
7A
8B
9C
10A
11B
12C
13D
14A
15C
Exercise 6:
1D
2D
3B
4D
5C
6A
7C
8D
9A
10B