Câu hỏi: We should participate in the movement _________to conserve the natural environment.

A. which organized

B. organizing

C. to organize

D. organized

Câu 1: Some snakes have hollow teeth they are called fans that they use to poison their victims.

A. Some 

B. they are called

C. use

D. their

Câu 2: The result of the studies have had a strong impact on future developments.

A. of

B. have had

C. strong

D. on

Câu 3: Sleeping, resting, and to drink fruit juice are the best ways to cure for a cold.

A. Sleeping

B. to drink

C. juice

D. best ways

Câu 4: An endangered species is the one _________ population is so small that it is in danger of becoming extinct.

A. which

B. what

C. whose

D. who

Câu 5: "Be sorry for sending the wrong information, Kate" said Rita.

A. Kate sent the wrong information, and she was sorry.

B. Rita apologized to Kate for sending her the wrong information

C. Rita was sorry about Kate's sending the wrong information.

D. Rita was sorry for not sending Kate the information.

Câu 6: While Peter ________the rose bush in the back yard, the phone rang.

A. were watering

B. has watered

C. watered

D. was watering