1.As is known to all, it is teachers and parents who will have a big _____on the development of children.           

A. change                          B. affection                          C. influence                          D. impression

2.The library needs ________, but it'll have to wait until Sunday.           

A. cleaning                       B. be cleaned                       C. being cleaned                       D. to clean

3.Lily and I agreed _________ at 8:00 a.m. at my home, but so far she hasn't turned up yet.           

A. meeting                        B. having met                        C. to have met                        D. to meet