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

A. find

B. count

C. guess

D. learn

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: I love it when someone's laughter is funnier than the joke.

A. cry

B. shout

C. smile

D. frown

Câu 3: The speaker likes to have an attentive audience.

A. neglecting

B. positive

C. active

D. interested

Câu 4: I feel that learning English will help my chances of promotion at work.

A. improve

B. minimize

C. widen

D. facilitate

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

A. educated

B. healed

C. defended

D. brought

Câu 6: Man alone is born crying, lives complaining, and dies disappointed.

A. together

B. lonely

C. altogether

D. total