根据图文提示,补全句中所缺单词。
1. A: What are you doing?
B: I’m ________ my new stamps _______ my stamp book.
2. A: What did you see?
B: I _______ a ________ ________ in the street.
3. A: ______ you often _________ __________?
B: Yes, every day.
4. The light is red. _________ __________.