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

A. does

B. dos

C. do

D. is doing

Câu 1: Gold _______in California in the 19th century.

A. was discovered

B. has been discovered

C. was discover

D. they discovered

Câu 2: My mother told me __________ hard.

A. study

B. studying

C. to study

D. studied

Câu 3: – 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 4: At the end of the story, the prince and princess fall _________ love with each other.

A. in

B. on

C. for

D. at

Câu 5: It’s necessary __________ your listening and writing skills.

A. to improve

B. improve

C. improving

D. improved

Câu 6: He came up with the solution __________ every problem.

A. in

B. at

C. for

D. to