Ⅰ.单词拼写
根据汉语或首字母提示，写出下列单词
1．They're working hard to turn waste into useful materials (材料)．
2．What was your motivation (动机) for becoming a teacher?
3．To save energy，we'd better recycle (再利用) these waste bottles.
4．As we all know，few kinds of plants grow in the desert.
5．He paused for an instant before continuing his walk.
Ⅱ.拓展词汇
根据词性和汉语提示，写出下列单词
1．type v. 打字→typist n. 打字员→typewriter n. 打字机
2．receive v. 接收→receiver n. 接受者；接收器；电话听筒
3．represent vt.代表；象征→representative n. 代表；典型人物 adj.典型的；有代表性的
