1. His oral English is much better than ____.

　　A. you and me B. yours and mine C. me and you D. my and yours

　　2. He is ready to help others, so I am sure he is____ you

　　A. only too pleased to help B. too pleased to help

　　C. only too pleased in helping D. much too pleased to help

　　3. You didn’t hear us come in last night. That’s good. We tried ____noisy.

　　A. to be not B. not to be C. not being D. being not

　　4. Because of the traffic jam___ I was caught, I was late for the interview.

　　A. which B. that C. in that D. in which

　　5. The theory ____ liquid tends to expand when heated is easy for us to understand.

　　A. which B. / C. what D. that

　　1. [B]

　　解析：名词性物主代词 yours and mine = your oral English and my oral English

　　2. [A]

　　解析：在“only too + adj.+ to do”结构中，不定式的含义是肯定的，only too=very

　　3. [B]

　　解析：try to do sth. 努力做某事;try doing sth. 试着做某事

　　4. [D]

　　解析：which 作be caught in的宾语，由于介词in提前，所以不能用that

　　5. [D]

　　解析：that 引导同位语从句，解释说明theory的内容。