1.You should write him a letter. (就划线部分提问)

　 __________　 _________　 _________do?

20.(　　 ) They are good friends , but sometimes they ______each other .

　 A. argue of　　 B. argue　　 C. argue to　　 D. argue with

19.(　　 )I really don’t know _________.

　　 A. what should I do　　 B. what to do　　 C. what does　　 D. what doing

18.(　　 )Our teacher often tells us _____ to the old politely .

　　 A. speak　　 B .speaking　　　 C. to speak　　　 D. speak in

17.(　　 ) I ______ it everywhere , but I didn’t　 _____ it .

　　 A . looked for , looked for　　　　 B. looked for , find　

　　 C. found , looked for　　　　　　 D. find , look for

16.(　　 ) They are ______ the summer holiday .

　　 A. planning　　 B. planing　　 C. planned　 D. plans

15.(　　 )When I arrived home , I remembered that I ______ my key in the classroom .

　　 A. forget　 B. forgot　　　 C. leave　　 D. left 　

14.(　　 )I need to get some money to _____the summer camp .

　　 A . pay on　　 B. pay in　　　 C. pay with　　　 D. pay for

13.(　　 )Please show me the ticket ______the concert　　

A. of　　　　 B. for　　　 C. to　 D .on

12.(　　 ) The boy is ______to go to school .　

　A. enough old　　 B. enough young　 C. old enough　 D. young enough