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

A. was discovered

B. has been discovered

C. was discover

D. they discovered

Câu 1: Tom is watching TV now. So ____________.

A. does Mary

B. Mary

C. is Mary

D. Mary does

Câu 2: It’s necessary __________ your listening and writing skills.

A. to improve

B. improve

C. improving

D. improved

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

A. by

B. in

C. for

D. of

Câu 4: We decided ________ at home this afternoon.

A. staying

B. stayed

C. stay

D. to stay

Câu 5: Your sister used to visit you quite often, ________?

A. didn't she

B. doesn't she

C. wouldn't she

D. hadn't she

Câu 6: When my father was young, he _____ work in the garden for long hours.

A. can

B. could

C. will

D. should