12. If I ________ time, I will write to you.

A. to have

B. will have

C. had

D. have

13. I was tired. ________, I went to bed early last night.

A. However

B. Therefore

C. Because

D. So

14. Where are the photos ________ were taken at the Christmas party?

A. who

B. which

C. whom

D. whose