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: Annette spent a year long to search for scholarship; ................, she did not get positive result.

A. therefore

B. moreover

C. still

D. asa result

Câu 2: The Wagners ................ to Florida two years ago.

A. moved

B. had been moving

C. move

D. will move

Câu 3: Louise was listening to the radio while she .................. the house.

A. is cleaning

B. was cleaning

C. had cleaned

D. will dean

Câu 4: 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 5: The new project received a lot of financial assistance from the WTO; ..............., it could easilybe approved by the authority.

A. thus

B. on the other hand

C. on the contrary

D. inaddition

Câu 6: We .............. since 5:00.

A. talk

B. are talking

C. talking

D. have been talking