1. 用方框中所给单词的适当形式填空

thunderstorm,   sunrise,   set,   snow,   cloud

1. （1） It is . Everything is white.
3. （2） Many people like to climb to the top of Mount Tai to watch the .
5. （3） In summer, there are often in my hometown. The ground is always wet.
7. （4） Tomorrow evening the sun at 7:00 p. m.
9. （5） It's going to rain. It is dark and .