根据括号里所给词的提示完成下列句子

根据括号里所给词的提示完成下列句子1.I forgot _______(finish) my homework.I'm sorry,sir.2.The boy ________(wear) a blue sweater is Li Lei.3.The supermarket is very ______(crowd)every day.4.The train travels ________(slowly) than the plane.