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: If the trend continues, the averageincome ............. by 107% by 2020.

A. will increase

B. will have increased

C. will be increasing

Câu 2: They ................. personal computerswhen my father was a student.

A. hadn’t

B. didn’t have

C. weren’t having

Câu 3: The manager interviewed ........... candidates in turn.

A. each of the

B. each

C. every

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 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 6: You can base your geographyassignment on ................ country – itdoesn’t matter which.

A. a

B. some

C. any