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: He enjoys _____ in the rain.

A. walk

B. walks

C. to walk

D. walking

Câu 2: He _____ to give up smoking since last week.

A. was trying

B. have tried

C. has tried

D. tried

Câu 3: Do you mind _____ up?

A. wash

B. washing

C. washed

D. to wash

Câu 4: 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 5: You shouldn't spend all your time.....................

A. study

B. to study

C. studying

D. studied

Câu 6: 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