题目内容：

根据句意和首字母填单词。

1.Spring has come and leaves in the trees begin to t________ green.

2.There are many c__________ in China during Spring Festival.

3.I invited Tom to my birthday party， but he r          .

4.There is someone k              at the door ， please go and see who it is.

5.New p____________ from this small company are popular with young children and are sold out soon.