Câu hỏi: Doctors _____ a cure to AIDS yet.

A. have found

B. found

C. haven't found

D. hasn't found

Câu 1: 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 2: Ann is interested in.................... young children.

A. teach

B. teaches

C. to teach

D. teaching

Câu 3: I…………..at the checkout when I………….. a strange-looking man.

A. waited/noticed

B. was waiting/noticed

C. waited/was noticing

D. was waiting/had noticed

Câu 4: He _____ to give up smoking since last week.

A. was trying

B. have tried

C. has tried

D. tried

Câu 5: Do you mind _____ up?

A. wash

B. washing

C. washed

D. to wash

Câu 6: Fish were among the earliest form of life. Fish ………….. on earth for ages and ages.

A. existed

B. are existing

C. have existed

D. exist