Humans depend on species diversity to have food, clean air and water and fertile soil.......agriculture.

A. as early than

B. more early than

C. earlier than

D. as early as

A. will finish

B. finish

C. finished

D. had finished

A. Surprise

B. Surprised

C. Surprising

D. Surprisingly

A. may

B. mustn't

C. should

D. needn't

A. No one in the world plays the guitar as well as you.

B. No one in the world play the guitar as bad as you.

C. No one in the world plays the guitar as badly as you.

D. No one plays guitar as badly as you in the world.

A. British women did not have the right to vote in political elections

B. most women did not wish to have equal status and equal rights

C. British women did not complete their traditional supporting role

D. suffragettes fought for the equal employment and equal pay.

A. The life of Langston Hughes

B. The Harlem Renaissance

C. African-American writers

D. American twentieth-century writers