Choose the correct answer

Listen! Some one ………………… the door. *
4 điểm
A. knocks
B. knock
C. is knocking
D. are knocking
I spent most of free time …………….. on the internet when I was young. *
4 điểm
A. wandering
B. to wander
C. wandered
D. all are correct
I don’t want to see that film …………. it is so violent. *
4 điểm
A. so
B. because of
C. because
D. although
We are interested ……………….. watching TV every night. *
4 điểm
A. on
B. in
C. at
D. of