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

A. was discovered

B. has been discovered

C. was discover

D. they discovered

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: He came up with the solution __________ every problem.

A. in

B. at

C. for

D. to

Câu 3: When we were on holiday, we used ________ to the beach every day.

A. go

B. to go

C. going

D. gone

Câu 4: Ba always ____________ the homework before going to class.

A. does

B. dos

C. do

D. is doing

Câu 5: If I __________a lot of money now, I ______________a new car.

A. have /will buy

B. have / would buy

C. had/ will buy

D. had/ would buy

Câu 6: He told me ___________ my best to study English.

A. try

B. trying

C. to try

D. tried