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

A. find

B. count

C. guess

D. learn

Câu 1: Kevin stopped to buy the evening paper from a news vendor.

A. purchase

B. get

C. sell

D. give

Câu 2: The plants and animals of the sea fall into three major groups.

A. small

B. chief

C. minor

D. main

Câu 3: 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 4: Advanced students need to be aware of the important of collocation.

A. of high level

B. of great important

C. of low level

D. of steady progress

Câu 5: Last night they stayed at home and watched TV.

A. day

B. noon

C. midnight

D. morning

Câu 6: It's cool and quiet everywhere except in the kitchen.

A. windy

B. freezing

C. cold

D. hot