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

A. windy

B. freezing

C. cold

D. hot

Câu 2: Man alone is born crying, lives complaining, and dies disappointed.

A. together

B. lonely

C. altogether

D. total

Câu 3: The plants and animals of the sea fall into three major groups.

A. small

B. chief

C. minor

D. main

Câu 4: Fish only species that are not of concern, threatened or endangered.

A. bettered

B. born

C. safeguarded

D. taught

Câu 5: I feel that learning English will help my chances of promotion at work.

A. improve

B. minimize

C. widen

D. facilitate

Câu 6: There is growing concern about the way man has destroyed the environment.

A. attraction

B. worry

C. disinterest

D. careless