选择适当的单词填空。

1. The _______ (direct, direction) of wind is always changing in my hometown.

2. It is _______ (simply, simple) a phone number.

3. It's midnight and everything is ______ (sleep, sleepy) and quiet.

4. He is a great _______ (poet, poem, poetry) in ancient China.

5. His _______ (interrupt, interruption) stopped our meeting.

6. The _______ (expect, unexpected) knock on the door surprised every one.