单选题：_____ seemed that he _____read the book before. [ ]A. He;..

_____ worries me that he keeps changinghis mind.A. This B. ThatC. What D. It

— In the countryside you can enjoy fresh air, blue sky and quiet surroundings.— _______ more and more retired people are escaping from the crowded city. [ ]A. It is no wonder B. It is no doubt C. there is no need D. there is no possibility

Did he find_____ hard to learn a foreign language?[ ]A. thatB. himC. itD. himself

He didn't make _____ clear when and where the meeting would be held.[ ]A. theseB. thisC. itD. that

—Who should be responsible for the accident?— The boss, not the workers. They just carry out the order _____. [ ]A. as told B. as are told C. as telling D. as they told