几道简单的英语试题；最好解释一下选的原因
1,It's a bad habit ( ) after dinner .
A.ran B.run C.runs D.to run
2,I'm free now .What do you want me （ ） for you?
A.do B.done C.to do D.doing
3,My mother always tells me ( ） to the teacher s carefully in class.
A.listen B.listened C.to listen D.listening
4,When she heard the exciting news,she could feel her heart( ) fast.
A.beats B.beating C.to beat D.beaten
5,They set out ( ) for the boy.
A.searching;losing B.searching;lost C.to search;lost D.to search;missed