Fill in the blanks.用所给单词的正确形式填空.
1.On Saturday we're going to （have）a picnic.
2.I'm （tall） than Xiaoxiao.
3.On Tuesday,I'II （play）with my fr
4.Beijing is （big）than Tianjin.
5.This boy is (good)than the girl.
6.My hair (is)so short,then.But now my hair (is)long.