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: I finished my essay yesterday but ………. it in to the tutor yet.

A. I’ve given

B. I haven’t givencorrect

C. I didn’t give

Câu 2: Nina and her friends had a great time, singing and dancing and............. to their favourite music.

A. listening

B. hearing

C. looking

Câu 3: …………. i the doctor at 2.00 this afternoon so I can’t go to the lecture.

A. I’m seeingcorrect

B. I see

C. I will see

Câu 4: The teacher..................... us how to do the experiment when the fire bell rang.

A. showed

B. shown

C. was showing

Câu 5: I ........... want to be a practisingdoctor but now I’m more interested in research.

A. was used to 

B. used to 

C. would

Câu 6: She..................some friends to her house for a party.

A. decided

B. agreed

C. invited