Câu hỏi: The teacher ............... us how to do theexperiment when the fire bell rang.

A. showed 

B. shown

C. was showing

Câu 1: I don’t know whether to accept the joboffer. It’s .................

A. a difficult decision

B. the difficult decision

C. difficult decision

Câu 2: Her mother made a big chocolate........... with ‘Happy Birthday’ on the top. 

A. meal

B. cake

C. dish

Câu 3: They.......................personal computers when my father was a student.

A. hadn’t

B. didn’t havecorrect

C. weren’t having

Câu 4: ............. the experiment three timesnow with different results each time!

A. We’ve done

B. We did

C. We’ve been doing

Câu 5: From this graph we can see that theeconomy.................. at the moment.

A. improves

B. improve    

C. is improving

Câu 6: When I arrived the lecture .............. so I didn’t find it easy to follow.

A. started

B. had started

C. had been starting