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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She________hernervousnesstotheimportanceoftheinterview.
________theconcerthadbegundidwerealizewhatasplendidshowitwasgoingtobe.
Humanbehaviorismostlyaproductoflearning________thebehaviorofanimalsdependsmainlyoninstinct.
TheTVstation,in________tomassivepopulardemand,decidedtocontinuethesoapopera(肥皂剧).