Câu hỏi: 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 1: ……….. is the state of not knowing how to read or write.

A. literacy

B. illiteracy

C. campaign

D. struggle

Câu 2: Deserts often include _________ and rocky surface.

A. oil

B. water

C. sand

D. trees

Câu 3: This is the instance where big, obvious non-verbal signals are appropriate.

A. situation

B. attention

C. place

D. matter

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: We must start a …………. for illiteracy eradication immediately

A. contest

B. company

C. champion

D. campaign

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

A. danger

B. border

C. margin

D. verge