Câu hỏi:  Tobacco has bad effects ……… our health.

A. on

B. from

C. at

D. of

Câu 1:  I am looking forward ……….. seeing you.

A. to

B. for

C. on

D. at

Câu 2: We …… a lot important scientific discoveries in 2050.

A. have

B. will have

C. had

D. has had

Câu 3: We ……... for our cars.

A. is looking

B. have been looking

C. are looking

D. is going to look

Câu 4: We will send these letters to him when we …. in London.

A. will arrive

B. arrive

C. arriving

D. have arrived

Câu 5: There are more and more people died …… AIDS.

A. on

B. from

C. at

D. of

Câu 6: ………. each of you ready for the test?

A. is

B. are

C. have

D. do