用括号内所给词的适当形式填空，每空一词。

1. It is much ________(dry)in Yun Nan province than before because it hasn't rained for a long time.

2. My friend's ________(twelve)birthday is coming. Please help me choose a present for her.

3. Song Zuying sings very well. People like her sweet voice and she is a ________(success) singer.

4. Li Lei and Li Liang are twins, but there are many_________ (different) between them.

5. This is an easy problem. I think you can work it out _________ (easy).

1. _________2. _________3. _________4. _________5. _________