用所给单词的适当形式填空。
1. Mr Chen wrote a lot of __________ (poem) in his life.
2. Becky is making a speech, ________ (hold) some flowers.
3. My brother ________ (ride) his bike and went to the post office this morning.
4. Could you speak louder? I can't hear you _________ (clear).
5. I'm afraid of snakes. They are ____________ (frighten).
