Câu hỏi: Clean air is necessary ........... our health.

A. to

B. for

C. on

D. with

Câu 1: She is very jealous ......... her sister.

A. to

B. of

C. with

D. by

Câu 2: Boys! Put your toys ............ It is time to go to bed. Don't stay ............. late.

A. off / on

B. away / up 

C. down / off

D. around / for

Câu 3: We were very doubtful .............. his ability.

A. about

B. with

C. for

D. to

Câu 4: Due to industrialization, we have to cope ... the fact that many  species are ......... danger ........ extinction.

A. over / at / for

B. at / upon / over

C. for / on / with

D. with / in / of

Câu 5: This organization is quick ... sending relief goods to the flooded areas.

A. with

B. at

C. for

D. about

Câu 6: I'm very sorry ............. what I have done.

A. with

B. to

C. for

D. by