Câu hỏi: I and Kenny______ pen pal friends since I_______ Singapore.

A. are/ visit

B. were/ have visited

C. were/ visited

D. have been/ visited

Câu 1: The students got the librarian_________ books for them.

A. buying

B. to buy

C. buy

D. bought

Câu 2: Before becoming successful, Charles Kettering, former vice president of General Motors, was so poor that he has to use the hayloft of a barn as a laboratory.

A. as

B. so poor

C. has to

D. successful

Câu 3: Air pollution, together with littering, are causing many problems in our large, industrial cities today.

A. are

B. industrial

C. problems

D. with

Câu 4: Mark hopes _______ a small part in the school play.

A. to get

B. getting

C. get

D. got

Câu 5: Mike came across his old friend - Maria while he _______ along the street.

A. had walked

B. would walk

C. was walking

D. walked

Câu 6: It was hot, _________ I turned on the conditioner.

A. however

B. but

C. because

D. so