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: Doctors _____ a cure to AIDS yet.

A. have found

B. found

C. haven't found

D. hasn't found

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

A. was trying

B. have tried

C. has tried

D. tried

Câu 3: Glenda…………..extremely hard when she was a student.

A. worked

B. has worked

C. was working

D. had been worked

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

A. study

B. to study

C. studying

D. studied

Câu 5: The World War II ………….. in 1939 and ………….. in 1945.

A. begins/ends

B. had begun/ended

C. has begun/had ended

D. began/ended

Câu 6: The sun . . . . . . . . . . . . . . . in the east.

A. rise

B. rose

C. rises

D. rising