( )21. --- I’m too busy _______ to my family.

　　--- Why not call them instead?

　　A. writing B. to write C. written D. write

　　( )22. The little boy woke up his father, _______ “Happy Birthday!”

　　A. call B. to call C. called D. calling

　　( )23. The car _______ in Germany in the 1960s looks old now.

　　A. produced B. producing

　　C. to produce D. which produced

　　( )24. --- What are on show in the museum?

　　--- Some pictures _______ by the Africans.

　　A. drawing B. drawn C. drew D. were drawn

　　( )25. The sick man stayed in bed, _______ very terrible.

　　A. felt B. feeling

　　C. is feeling D. was feeling

　　( )26. --- The boy was seen _______ his bike a moment ago.

　　--- I am sorry to hear that.

　　A. fell off B. to fall off

　　C. fall off D. to fall down

　　( )27. There’re so many beautiful presents in the shop that I don’t know _______.

　　A. to choose which one B. what choose

　　C. which one to choose D. to choose what

　　( )28. --- How bad! They still have no ideas how _______ the problem.

　　--- Let’s go to help them.

　　A. solving B. solved C. to solve D. solves

　　( )29. What is the best way do you think ______ the wild animals?

　　A. protecting B. to protecting

　　C. protected D. to protect

　　( )30. --- You’d better have your sports jacket _____. It’s too dirty.

　　--- Thanks. I will.

　　A. to wash B. washed C. washing D. wash