"________________________"

A.I think. 　 B. Yes, I can.

C. I can't think so　 D. No, thanks

6.( ) The students are going to ______ trees on the hill.

A. playing to B. planting C. plant D. working

7.( ) I want ________ the house. Could you ________ me?

A. clean; help　　　　　B. to clean; help

C. to clean; to help　　D. cleaning; to help

8.( ) The children are __________TV now.

A. watching　B. reading　C. looking　D. seeing

9.( ) What _____ the man ______ over there?

A. is, do　B. are, doing　C. is, doing　D. are, do

10.( ) Where's my pencil-box? I ______ it.

A. am not seeing　　B. am not finding

C. can't find　　　 D. can't look at

   11.( ) It's time to ______ up.