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

A. concerned

B. pleased

C. frightened

D. excited

Câu 3: Fish only species that are not of concern, threatened or endangered.

A. educated

B. healed

C. defended

D. brought

Câu 4: The plants and animals of the sea fall into three major groups.

A. small

B. chief

C. minor

D. main

Câu 5: Be quiet or you'll wake the whole house!

A. still

B. noisy

C. peaceful

D. tranquil

Câu 6: The speaker likes to have an attentive audience.

A. neglecting

B. positive

C. active

D. interested