Câu hỏi: It _______ it is parents' responsibility to take good care of their children.

A. commonly says that

B. commonly to be said that

C. is commonly said that

D. is commonly saying

Câu 1: John is _______ only child in his family so his parents love him a lot.

A. a

B. an

C. the

D. no article

Câu 2: We are not allowed _______ jeans at school.

A. wear

B. to wear

C. wearing

D. worn

Câu 3: Sometimes Mr. Pike has to work very late _______ night to do some important experiments.

A. in

B. at

C. for

D. on

Câu 4: Mark first ____ his wife three years ago when they _____ at university.

A. met - have studied

B. met - were studying

C. has met - studied

D. met - had been studying

Câu 5: Although we ______ all day, we haven’t managed to find a suitable applicant.

A. are interviewing

B. had interviewed

C. have been interviewing

D. interviewed

Câu 6: These quick and easy _______ can be effective in the short term, but they have a cost.

A. solve

B. solvable

C. solutions

D. solvability