3．He was very angry and t _______ the letter into pieces．

2．My s _______ is very good．She always helps me a lot run the firm．

1． You're passed your driving test? C ______.

20． It has been a long time since I　 ______. How are you?　　　　　　

　A．had last seen you　B．last saw you

　C．have last seen you　D．last was seeing you

19．He closed the door quietly　 ______　 wake his mother,　 who was asleep.　　　

　A．so that not to　B．in order to

　C．so as not to　D．in order that

18．If it ______ rain tomorrow we'll have a picnic．　　　　　　　　　　　

　A．wouldn't　B．doesn't　C．didn't　D．won't

17．That was the last time　 ______ I saw my dear uncle.　　　　　　　　

　A．which　B．that　C．when　D．but

16． Congratulations　 _______ your success the competition.　　　　

　A．on,　 on　B．in,　 in　C．on,　 in　D．in,　 on