Câu hỏi: He worked hard ________ a mechanic for ten years before being appointed manager.

A. as

B. at

C. with

D. by

Câu 1: When are you leaving __________ Singapore? This week or next week?

A. for

B. to

C. from

D. of

Câu 2: She’s very old and can’t live alone. She needs someone to look _________ her.

A. up

B. for

C. after

D. through

Câu 3: His father used the money he won to set_________ his own company.

A. down

B. up

C. at

D. in

Câu 4: We benefit greatly ____________the medicines and other products that biodiversity provides.

A. from

B. without

C. for

D. at

Câu 5: Pay attention _______all traffic signs when you are travelling in the street.

A. for

B. on

C. to

D. from

Câu 6: Toxic chemicals in the air and land have also driven many species ______ the verge of extinction.

A. of

B. about

C. at

D. to