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: 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 2: I ................. the house before you called.

A. leave

B. am leaving

C. had left

D. had been leaving

Câu 3: I ............... on the bus when I dropped my wallet.

A. am getting

B. get

C. have gotten

D. was getting

Câu 4: We .............. to the baseball game when it started to rain.

A. are driving

B. drives

C. driven

D. were driving

Câu 5: Kevin can’t talk on the phone because he .............. dinner right now.

A. is eating

B. eats

C. has eaten

D. has been eating

Câu 6: Rita .................. class every day.

A. not to attend

B. doesn’t attend

C. not attending

D. isn’t attended