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

A. literacy

B. illiteracy

C. campaign

D. struggle

Câu 1: The SEA GAMES is a ____________ multi-sport event involving participants from the current 11 countries of Southeast Asia.

A. annual

B. biennial

C. triennial

D. quadrennial

Câu 2: ______- is natural environment in which plant or animals live.

A. Ecology

B. Habitat

C. Extinction

D. Biodiversity

Câu 3: Each nation has many people who voluntarily take care of others.

A. bring along

B. get on with

C. keep up with

D. look after

Câu 4: Billy, come and give me a hand with cooking.

A. help

B. prepared

C. be busy

D. attempt

Câu 5: Many plants and animal species are now on the _______ of extinction.

A. danger

B. border

C. margin

D. verge

Câu 6: Deserts often include _________ and rocky surface.

A. oil

B. water

C. sand

D. trees