Câu hỏi: We .............. since 5:00.

A. talk

B. are talking

C. talking

D. have been talking

Câu 1: The telephone .............. ten times before Patsy finally answered it.

A. rings

B. ringing

C. had rung

D. is ringing

Câu 2: The old drainage pipelines must be maintained; ................, leakage will be unavoidable.

A. therefore

B. similarly 

C. on the contrary

D. otherwise

Câu 3: My parents    ........... in Florida since 1999.

A. has lived

B. have lived

C. are living

D. live

Câu 4: The Wagners ................ to Florida two years ago.

A. moved

B. had been moving

C. move

D. will move

Câu 5: We ....................... in the plane for hours when it finally, took off.

A. had been sitting

B. have sat

C. will be sitting

D. will sit

Câu 6: By next month, I ...................... at this company for a year.

A. will work

B. will be working

C. will have been working

D. am going to work