听录音,填入所缺单词。
1. A: It's ________ o'clock. B: It's time for ________.
2. A: Liu Tao, please ________ the door. B: OK.
3. A: ________ is this? B: My ________.
4. A: Are ________ ________? B: Yes, they are.
5. A: Where is my pencil? B: It's ________ the book.