题目内容：

根据句意，写出括号内所给单词的适当形式。

1.There are smaller and older teaching buildings in our school than those in _________(they)

2.Qi Baishi’s Chinese ________________ (paint) sell well now .

3.Mary is very ____________(help) and often helps others .

4.September is the ____________ (nine) month of a year .

5.Christmas Day is one of the __________( west) festivals.