1．He ____________(teach) in China for ten years by the end of last month．
答案：had taught
2．Who is it that the old building ____________(belong) to? Could you tell me?
答案：belongs
3．He was often late for work, ____________ made his boss very disappointed．
答案：which
4．____________ we had expected, the girl failed in the test again．
答案：As
5．The reason for ____________ she cried wasn’t known to most of us．
答案：which
