用括号所给词的正确形式填空.（小学英语）
1.Tom is______（tall）than Jim.
2.I’m still____________（short）than you.
3.The boy is__________（heavy）than me.
4.I can do________（good）in the teat.
5.Which is___________（fast）,a bike or a car?
6.Who is____________（tall）,Mary or Joan?