1. I would appreciate ______ it a secret. A. your keeping B. that you keep C. you to keep D. that you will keep
2. Applied science is ______ discovering ways to use the knowledge of theoretical science. A. concerned about B. combined with C. concerned for D. concerned with
【补全句子】 1. I didn’t _____ ________ _________ on the phone. （在电话里我没听出她的声音。）
