15.　 What’s your plan for the coming holiday? I ___________ (visit) Beijing if possible.

14.　 By the time I got home, my parents ____________ (have) supper.

13.　 He said he____________ (be) to the Great Wall four times.

12.　 I think the computer ____________ (invent) before the TV.

11.　 He ___________ (live) in Beijing since he was eight years old.

10.　 If it __________ (be) fine, we’ll go fishing tomorrow.

9.　　　 It takes me half an hour __________ (walk) to work every day.

8.　　　 It’s raining now. We have to put off ____________ (have ) a picnic.

7.　　　 You’re only twelve years old. Don’t get your ears _____________ (pierce).

6.　　　 When they are together, they talk instead of __________ (do) homework.