11. The reason _____ I can’t come is that I have to prepare for the coming exam.
A. for
B. as
C. because
D. why
12. She studied hard at school when she was young; _____ contributes to her success in her career.
A. that
B. so that
C. so
D. which
13. I’ve got a bottle of beer, but I haven’t got anything _____ I can open it with.
A. that
B. what
C. where
D. which
14. _____ the day went on,the weather got worse.
A. With
B. Since
C. While
D. As
15. It wasn’t such a good present _____ he had promised me.
A. that
B. as
C. which
D. what
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