省略句练习题1. _ time, hell make a first class tennis player.A. Having given B.To give C. Giving D. Given2.Susan,go on. Your sister is cleaning the yard.-Why_? John is sitting there doing nothing.A. him B. he C. I D. me3.Generally speaking, _according to the direction, the drug has no side effect.A. when taking B. when taken C. when to take D. when to be taken4. Unless _ to speak, you should remain silent at the conference.A. invi