Choose the best work and phrase ( A, B, C or D ) to complete the sentences below

Choose the best work and phrase ( A, B, C or D ) to complete the sentences below.
1. Duong ………. piano lessons every Saturday.
A.Plays
B.Has
C.Studies
D.Goes
2. The window is ………. the big door.
A. Behind
B. Next to
C. Under
D.On
3. The USA has ………natural wonders.
A.many
B.much
C.a little
D.any
4. “Let’s go to the department.”  “…………”
A.great idea
B.yes, I like
C.no. thanks
D.very well
5. How about ……… some pictures?
A.buy
B.to buy
C.buys
D.buying