Câu hỏi: Louise was listening to the radio while she .................. the house.

A. is cleaning

B. was cleaning

C. had cleaned

D. will dean

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: Before the police arrived, the robbers ..........................

A. run

B. had run

C. have run

D. have been running

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

A. rain

B. rains

C. is raining

D. is rain

Câu 4: I ............... on the bus when I dropped my wallet.

A. am getting

B. get

C. have gotten

D. was getting

Câu 5: Paul and Linda .............. us to their party last weekend.

A. was inviting

B. invited

C. had been inviting

D. will invite

Câu 6: It ............... a lot last winter.

A. snows

B. has been snowing

C. snowed

D. snow