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

A. in

B. at

C. for

D. to

Câu 1: What should you consider before _________ for an exercise class?

A. sign up

B. to sign up

C. signing up

D. will sign up

Câu 2: When my father was young, he _____ work in the garden for long hours.

A. can

B. could

C. will

D. should

Câu 3: My mother told me __________ hard.

A. study

B. studying

C. to study

D. studied

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: My friend and I _______ your sister tomorrow afternoon after she _______ her work.

A. will meet-will finish

B. will meet-has finished

C. will have met-has finished

D. will have met-will finish

Câu 6: Gold _______in California in the 19th century.

A. was discovered

B. has been discovered

C. was discover

D. they discovered