用所给单词的适当形式填空

1. I can't understand you. Please explain it to me ________(clear)

2. Haiku is _________(simple) what is happening in this place, at this moment.

3. Do you know how to _________(pronunciation) this word?

4. He felt very ________(sleep) after the long walk.

5. To write poems needs ________ (imagine).