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

A. catch

B. hold

C. take

D. have

Câu 1: 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 2: 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 3: It is easy to open a shop but hard to keep it always open.

A. welcome

B. appear

C. switch

D. close

Câu 4: Last night they stayed at home and watched TV.

A. day

B. noon

C. midnight

D. morning

Câu 5: We know not what is good until we have lost it.

A. find

B. count

C. guess

D. learn

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

A. neglecting

B. positive

C. active

D. interested