Câu hỏi: 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

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: I'd like to borrow this book. .................................. it yet?

A. Did you read

B. Had you read

C. Have you read

D. Do you read

Câu 3: He _____ to give up smoking since last week.

A. was trying

B. have tried

C. has tried

D. tried

Câu 4: Do you mind _____ up?

A. wash

B. washing

C. washed

D. to wash

Câu 5: Are you looking forward.................... on your cassation?

A. you go

B. going

C. to going

D. to go

Câu 6: Doctors _____ a cure to AIDS yet.

A. have found

B. found

C. haven't found

D. hasn't found