3, D. for (Leave for somewhere: Rời đến nơi nào)
4, A. Here you are: của bạn đây
5, D. would be
6, C. job
7, A. Will
8, C. surprised
9, A. sure (Make sure (of something/that..) : đảm bảo, chắc chắn)
10, B. listening
11, B. visits
12, A. how
13, A. was taken
14, B. is studying
15, C. valuable
CHÚC BẠN HỌC TỐT!