选单词：1.His mather made him ( )the floor every day.
A.sweep B.to sweep C.sweeping D.sweeps
2.I can't go with you tonight ( )I have homework to do.
A.before B.after C.because D.if
3.The grass and trees ( )yellow in autumn.
A.are B.change C.turn D.get
4.The students have ( ) on Sunday.
A.no any classes B.not classes C.no classes D.not class