1.My computer ís being repaired at the moment.

->I am having.............a computer repairing atm.......................

2.We must do something to protect the environment.

->Something must..........been did by us to pte..................

3.I’m sure that he didn’t attend the Conference o Wildlife Protection last week.

->He can’t........attend the Conference o Wildlife Protection last week....................................................

4. My wallett has _______. It must ___________ .

A/ disappeared/ be stolen B/ been disappeared/ be stolen C/ disappeared/ have stolen D/ been disappearing/ stolen

5. I haven’t received the letter yet. It might _______ to the wrong address.

A/ send B/ have sent C/ be sending D/ have been sent

6. After _______ , the man was taken to the police station.

A/ arresting B/ being arrested C/ was arrested D/ having arrested

1. I am having my computer repaired at the moment.

2. Something must be done to protect the environment.

3. He can’t have attended the Conference on Wildlife Protection yesterday.

4. A

5. D (have → has)

6. B