用所给词的适当形式填空
【小题1】I’m a teacher. It’s great _______ (work) with children.
【小题2】Why not _______ (try) your best _______ (do) that again?
【小题3】Who is the _______ (popular) teacher in your school?
【小题4】Can you _______ (cheerful) him up when he is in a bad mood?
【小题5】When my friends are sad, I think the _______ (happy) will be far away from me too.
【小题6】Of all the _______ (run), she is the best one I have ever seen.