Câu hỏi: Use water sparingly and keep water clean.

A. dusty

B. dirty

C. wicked

D. halfway

Câu 1: We know not what is good until we have lost it.

A. find

B. count

C. guess

D. learn

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

A. welcome

B. appear

C. switch

D. close

Câu 3: The wise man has long ears and a short tongue.

A. short

B. prolonged

C. high

D. crooked

Câu 4: I love it when someone's laughter is funnier than the joke.

A. cry

B. shout

C. smile

D. frown

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

A. bettered

B. born

C. safeguarded

D. taught

Câu 6: The business was acquired from Orion four years ago.

A. before

B. later

C. ahead

D. last