根据中文意思及句意，写出相应的单词。

1．How many colours are there in a____________ （彩虹）?

2．I'm busy these days，I haven’t__________ （答复）to Jim’s last e-mail．

3．colours Can change our__________ （心情）．

4．Mr. Smith is 60 years old．But he is still_________ （精力充沛的）．

5．Animals in forests are busy getting ready for the__________ （即将到来的）winter．