1. People _______________（往往会发胖）after giving up cigarettes because they turn to snacks as a substitute.
　　2. The frightened child _______________（紧紧抓住母亲的手臂）.
　　3. If we want to ________________（提前一个月完成这项工程的话）,we have to hurry with it.
　　4. When he succeeded in finishing his design,the technician _______________（似乎忘乎所以了）.
　　5. He is the sort of person ________________（你永远琢磨不透他讲的话）.

　　答案与解析：
　　1. tend to put on weight
　　2. grips his mother's arm
　　3. complete the project a month ahead of time
　　4. seemed to let himself go
　　5. whose words you never can make out