用所给单词的适当形式填空
1.Thomas Edison was a great American __________(invent).
He had more than one thousand __________(invent) in his life.
2. A sweater is used for __________(keep) warm.
3. What are the __________(brush) made of?
4. Jim was seen __________( go) out of the room.
5. Today nylon can __________( find) in many things.
