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

A. concerned

B. pleased

C. frightened

D. excited

Câu 1: The business was acquired from Orion four years ago.

A. before

B. later

C. ahead

D. last

Câu 2: 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 3: We know not what is good until we have lost it.

A. find

B. count

C. guess

D. learn

Câu 4: Keep only fish that you will eat; release the rest.

A. catch

B. hold

C. take

D. have

Câu 5: 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 6: Fish only species that are not of concern, threatened or endangered.

A. educated

B. healed

C. defended

D. brought