C
C
A
B
D
37B
38B
39C
40A
C->how often
B->was
B->because
C->sports
37B
39C
D
A
C
C
B
1B
2D
3A
4A
5D
6A
7B
8D
xuong duoi ik :>
D
lead to:dẫn đến