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

A. rings

B. ringing

C. had rung

D. is ringing

Câu 1: The old drainage pipelines must be maintained; ................, leakage will be unavoidable.

A. therefore

B. similarly 

C. on the contrary

D. otherwise

Câu 2: Television is a prime source of home entertainment; ................, it is a cheap babysitter.

A. furthermore

B. therefore

C. accordingly

D. on the contrary

Câu 3: I don't want to go outside today because it ....................

A. rain

B. rains

C. is raining

D. is rain

Câu 4: It ............... a lot last winter.

A. snows

B. has been snowing

C. snowed

D. snow

Câu 5: We always...................... a present to Elsa on her birthday.

A. are taking

B. taking

C. take

D. are taken

Câu 6: We .............. since 5:00.

A. talk

B. are talking

C. talking

D. have been talking