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

A. therefore

B. similarly 

C. on the contrary

D. otherwise

Câu 1: Mr. and Mrs. Wilson .............. some disputes with their neighbors.

A. having

B. have been having

C. have having

D. have been had

Câu 2: We .............. to the baseball game when it started to rain.

A. are driving

B. drives

C. driven

D. were driving

Câu 3: The store ..................... two sales so far this year.

A. is having

B. has been having

C. has

D. has had

Câu 4: I don't want to go outside today because it ....................

A. rain

B. rains

C. is raining

D. is rain

Câu 5: It ............... a lot last winter.

A. snows

B. has been snowing

C. snowed

D. snow

Câu 6: Barbara .................. that package to you tomorrow morning.

A. deliver

B. is going to deliver

C. are going to deliver

D. delivering