Câu hỏi: Use water sparingly and keep water clean.

A. dusty

B. dirty

C. wicked

D. halfway

Câu 1: Advanced students need to be aware of the important of collocation.

A. of high level

B. of great important

C. of low level

D. of steady progress

Câu 2: The plants and animals of the sea fall into three major groups.

A. small

B. chief

C. minor

D. main

Câu 3: One in seven accidents is caused by sleepy drivers.

A. awake

B. unwell

C. exhausted

D. talkative

Câu 4: The wise man has long ears and a short tongue.

A. short

B. prolonged

C. high

D. crooked

Câu 5: We know not what is good until we have lost it.

A. find

B. count

C. guess

D. learn

Câu 6: At times, this can be risky, and the keepers have been injured and one has been killed.

A. good

B. useful

C. healthy

D. secure