Câu hỏi: According to the research reports, people usually ………….. in their sleep 25 to 30 times each night.

A. turn

B. are turning

C. have turned

D. turned

Câu 1: Are you looking forward.................... on your cassation?

A. you go

B. going

C. to going

D. to go

Câu 2: Doctors _____ a cure to AIDS yet.

A. have found

B. found

C. haven't found

D. hasn't found

Câu 3: No breakfast for Mark, thanks. He…………..breakfast.

A.  has not eaten

B. did not eat

C. is not eating

D. does not eat

Câu 4: The news came as no surprise to me. I…………..for some time that the factory was likely to close.

A. knew

B. had known

C. have existed

D. exist

Câu 5: You shouldn't spend all your time.....................

A. study

B. to study

C. studying

D. studied

Câu 6: Just keep on................ what you like.

A. do

B. did

C. doing

D. done