Câu hỏi: 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

Câu 1: They don't seem particularly worried about the situation.

A. concerned

B. pleased

C. frightened

D. excited

Câu 2: Fish only species that are not of concern, threatened or endangered.

A. bettered

B. born

C. safeguarded

D. taught

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

A. awake

B. unwell

C. exhausted

D. talkative

Câu 4: Use water sparingly and keep water clean.

A. dusty

B. dirty

C. wicked

D. halfway

Câu 5: It's too far to ride to your grandmother's; you'd better take the bus.

A. remote

B. near

C. fast

D. besides

Câu 6: It's cool and quiet everywhere except in the kitchen.

A. windy

B. freezing

C. cold

D. hot