Unit 6 When was it invented？
Section A (1a—2 d)
Ⅰ. 根据句意及所给汉语提示，写出句中所缺单词。
1. The Russians were the ________ (先驱) o f space travel.
2. Music can offer ________ (愉快) to us, so many people like listening to it.
3. We have pencil boxes in all kinds of ________ (款式).
4. When I called Mike, he was ________ (列出) the things he wanted to buy.
5. Do you know when they will start the _ _______ (项目 )?
