Câu hỏi: ............. the experiment three timesnow with different results each time!

A. We’ve done

B. We did

C. We’ve been doing

Câu 1: …………. the doctor at 2.00 thisafternoon so I can’t go to the lecture.

A. I’m seeing

B. I see.

C. I will see

Câu 2: I don’t know whether to accept the joboffer. It’s .................

A. a difficult decision

B. the difficult decision

C. difficult decision

Câu 3: Most university students.................. on campus in their first year.

A. lives

B. livecorrect

C. are living

Câu 4: The manager interviewed ........... candidates in turn.

A. each of the

B. each

C. every

Câu 5: While we’re working on the project ourboss ................ on a beach in Greece!

A. will sit 

B. will have sat

C. will be sitting

Câu 6: From this graph we can see that theeconomy.................. at the moment.

A. improves

B. improve    

C. is improving