单选题：— I felt left out at the party last night. — Really? _____..

It was in this house _____ he heard some strange sounds. [ ]A. that B. where C. which D. who

"Not having returned home yet, _____", his father said to the police. [ ]A. his mother got worried B. his mother must be worried C. I think he is missing D. he must have got into some trouble.

His teacher kept telling him that he should recite the text, but _______ didn't help.[ ]A. itB. she C. heD. which

The fact that so many people still smoke in public places ________ that we may need a nationwide campaign to raise awareness of the risks of smoking.(2011·江苏)A．suggestB．suggestsC．suggestedD．suggesting

1. I find that it is difficult to learn English well, so I mu.st study harder. I find ______difficult_______ _____English well,so I must study harder.2. He didn't get married until he was in his thirties. It was______ _______he was in his thirties __