I always regretted not_________ harder when l was young． studyin9 。 having studied。 to study 。 D to have studied。
You can borrow that bicycle if you________． want to 。 want it：。 want to do。 will want。
Have you ever been to the museum_________ was built last year? which 。 where。 when。 what。
I don’t know why _______ late for class. you are。 are you。 are you being。 being you are 。
—When can I call on you, afternoon or evening? —________. I’ll be at home all the time. Any。 Either。 Both。 Neither 。
The room ________often cleaned by the students．
