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: My sister.................... economics andpolitics when she goes to university.

A. is going to study 

B. studies 

C. will study

Câu 2: When they had to go, everybody ................. Nina and her mother for the party.

A. said

B. thanked

C. told

Câu 3: When I arrived the lecture................ soI didn’t find it easy to follow.

A. started

B. had startedcorrect

C. had been starting

Câu 4: She..................some friends to her house for a party.

A. decided

B. agreed

C. invited

Câu 5: Nina was very............... because she got lots of present

A. interesting

B. lovely

C. happy

Câu 6: Most university students.................. on campus in their first year.

A. lives

B. livecorrect

C. are living