20．--- Oh, we ______ you at long last．

　　　 --- But is there anything that I can do for you? I don’t think I know you．

　　　 A．found　　　　　　　　　 B．have found　　　　　 C．are to find　　　　　 D．have been finding

19．Is there a shop around ______ we can get some fruit?

　　　 A．which　　　　　　　　 B．that　　　　　　　　　　 C．where　　　　　　　　 D．as

18．______ I’m willing to help, I do not have much time available．

　　　 A．Since　　　　　　　　　 B．When　　　　　　　　　 C．While　　　　　　　　　 D．Unless

17．I’m planning to hold a party in the open air, but I can make no ______ because it depends on the weather．

　　　 A．mistake　 　　　　　　 B．guarantees　 　　　　 C．decision　 　　　　　 D．words

16．Mr. White works as a journalist now, but he ______ in a high school for several years．

　　　 A．has worked　　　　 B．worked　　　　　　　 C．had worked　　　　 D．had been worked