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

A. sign up

B. to sign up

C. signing up

D. will sign up

Câu 1: Ba always ____________ the homework before going to class.

A. does

B. dos

C. do

D. is doing

Câu 2: Gold _______in California in the 19th century.

A. was discovered

B. has been discovered

C. was discover

D. they discovered

Câu 3: He told me ___________ my best to study English.

A. try

B. trying

C. to try

D. tried

Câu 4: He came up with the solution __________ every problem.

A. in

B. at

C. for

D. to

Câu 5: We decided ________ at home this afternoon.

A. staying

B. stayed

C. stay

D. to stay

Câu 6: – 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