Câu hỏi: He came up with the solution __________ every problem.

A. in

B. at

C. for

D. to

Câu 1: It’s necessary __________ your listening and writing skills.

A. to improve

B. improve

C. improving

D. improved

Câu 2: Alice wasn’t ___________ to be in my class.

A. too old

B. old enough

C. so old

D. such old

Câu 3: You should learn ________ heart all the new words for revision.

A. by

B. in

C. for

D. of

Câu 4: – Do you have to buy this hat? – No, I _____. It isn't necessary.

A. mustn't

B. won't

C. needn't

D. don't need

Câu 5: We decided ________ at home this afternoon.

A. staying

B. stayed

C. stay

D. to stay

Câu 6: My mother told me __________ hard.

A. study

B. studying

C. to study

D. studied