Câu hỏi: Do you know how many countries __________ part in the sporting event?

A. take

B. make

C. have

D. do

Câu 1: Deserts often include _________ and rocky surface.

A. oil

B. water

C. sand

D. trees

Câu 2: Some of the participating schools have also decided to use green cleaning products, which are safer since they do not ……. harmful chemicals into the environment.

A. release

B. expose

C. compound

D. deplete

Câu 3: I missed the lessons yesterday so I have to___________ on work.

A. put up

B. catch up

C. work up

D. go with

Câu 4: With the strong support of their countrymen, the Vietnamese athletes competed in ___________ spirits.

A. big

B. strong

C. high

D. lot

Câu 5: This is the instance where big, obvious non-verbal signals are appropriate.

A. situation

B. attention

C. place

D. matter

Câu 6: Many plants and animal species are now on the _______ of extinction.

A. danger

B. border

C. margin

D. verge