Câu hỏi: What about ___________ the solution together this afternoon?

A. find

B. finding

C. to find

D. to finding

Câu 1: The campaign will hopefully ensure the survival ...... the tiger.

A. of

B. for

C. to

D. on

Câu 2: The leopard is _________ the threat of extinction.

A. in

B. on

C. under

D. below

Câu 3: A hydroelectric dam ______________ in this area now.

A. is building

B. is being built

C. build

D. was built

Câu 4: ……………fax transmission is commonly used in most offices.

A. A

B. An

C. The

D. x

Câu 5: The panda's ...... habitat is the bamboo forest.

A. nature

B. natural

C. naturalized

D. naturally

Câu 6: People are destroying the air by adding ...... to it.

A. pollutants

B. polluters

C. pollution

D. polluted