3.Women, to air pollution before giving birth to a baby,are more likely to give birth to children with heart defects,researchers reported on December 29.( )
A. | exposed | B. | exposing | C. | are exposed | D. | are exposing |
2.Welcome to the Ice Bucket Challenge.The challenge is simple:when ,one either pours a bucket of icy water over his or her head or donates 100to the ALS Association.( )
A. | to challenge | B. | challenged | ||
C. | you challenged | D. | having challenged |
1.Mr Wang devoted all his time to_______ his spoken English before going abroad.( )
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A. | improve | B. | being improved | C. | improved | D. | improving |