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

A. was inviting

B. invited

C. had been inviting

D. will invite

Câu 3: Some people are using motorbikes for transportation; ....................., others are taking publicvehicles to get to their destination.

A. hence

B. otherwise

C. therefore

D. besides

Câu 4: Before the police arrived, the robbers ..........................

A. run

B. had run

C. have run

D. have been running

Câu 5: I don't want to go outside today because it ....................

A. rain

B. rains

C. is raining

D. is rain

Câu 6: My parents    ........... in Florida since 1999.

A. has lived

B. have lived

C. are living

D. live