Each year in the United States, many black teenagers _______ of school, either because they cannot keep up or they have to work to support their family.
B
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Insomeschoolschildrenwhoprefertoreadbooksratherthan________footballbecomesocialoutcasts(被抛弃者).
Theassociationis________toraisingfundstohelptheblind.
________withthesizeofthewholeearth,thehighestmountainsdonotseemhighatall.