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: The business was acquired from Orion four years ago.

A. before

B. later

C. ahead

D. last

Câu 2: They don't seem particularly worried about the situation.

A. concerned

B. pleased

C. frightened

D. excited

Câu 3: We can do something to save the earth.

A. kick

B. shoot

C. throw

D. destroy

Câu 4: How different a picture we now have of the ocean as the sea has begun to reveal its secrets.

A. public

B. opening

C. knowledge

D. schooling

Câu 5: Fish only species that are not of concern, threatened or endangered.

A. educated

B. healed

C. defended

D. brought

Câu 6: One in seven accidents is caused by sleepy drivers.

A. awake

B. unwell

C. exhausted

D. talkative