A. with B. of C. on D. to
A. cleaning B. to clean C. cleaned D. cleans
A. two hundreds B. hundreds of C. two hundred of D. hundred of
A. give B. get C. promote D. produce
A. one B. that C. it D. this
A. promotion B. production C. pollution D. polluted
A. 转弯 B. 旋转 C. 四处走走,到处转转 D. 逃跑
A. If B. Though C. So D. Because
A. to used B. using C. used D. to using
A. environmental B. encourage C. endanger D. enrich