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: Kevin stopped to buy the evening paper from a news vendor.

A. purchase

B. get

C. sell

D. give

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

A. find

B. count

C. guess

D. learn

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

A. bettered

B. born

C. safeguarded

D. taught

Câu 4: The wise man has long ears and a short tongue.

A. short

B. prolonged

C. high

D. crooked

Câu 5: As long as you are still alive, you will definitely encounter the good things in life.

A. well

B. surviving

C. sick

D. dead

Câu 6: He had never experienced such rudeness towards the president as it occurred at the annual meeting in May.

A. thought

B. hostility

C. care

D. politeness