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

A. is having

B. has been having

C. has

D. has had

Câu 2: My parents    ........... in Florida since 1999.

A. has lived

B. have lived

C. are living

D. live

Câu 3: Television is a prime source of home entertainment; ................, it is a cheap babysitter.

A. furthermore

B. therefore

C. accordingly

D. on the contrary

Câu 4: I .............. Michael for years.

A. have known

B. know

C. knowing

D. was known

Câu 5: The Smiths are eating less and exercising more; ..............., they can keep their weight down and stay in shape.

A. Consequently

B. also

C. nevertheless

D. otherwise

Câu 6: Kevin can’t talk on the phone because he .............. dinner right now.

A. is eating

B. eats

C. has eaten

D. has been eating