下列各句中，没有语病的一句是

Being young means having all kinds ofpossibilities, so you should challenge your limits and go ______ yourboundaries.

etao, who won four golds at the 2014 Incheon Asian Games, ______ himself as a new swim star.

May I smoke here?— No, you ______ . This is a no-smoking room.A．needn’t

I don’t think he is fit for the job, ______?——Why do you think so ?