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

A. welcome

B. appear

C. switch

D. close

Câu 1: We can do something to save the earth.

A. kick

B. shoot

C. throw

D. destroy

Câu 2: The wise man has long ears and a short tongue.

A. short

B. prolonged

C. high

D. crooked

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

A. find

B. count

C. guess

D. learn

Câu 4: Use water sparingly and keep water clean.

A. dusty

B. dirty

C. wicked

D. halfway

Câu 5: The plants and animals of the sea fall into three major groups.

A. small

B. chief

C. minor

D. main

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

A. bettered

B. born

C. safeguarded

D. taught