1.a young girl sat there,___(chew) a piece of gum
2.no one has come up with a __(convince) explanation of why this kind of animal died out.
3.the play was __(direct) by a very famous director.
4.the whole family were proud of his ___(outstand) performance.
5.when he read the book a second time,he found it ___(entertain).
6.John was a better songwriter than ___ (perform)