I.根据首字母或汉语提示填空 (1×10=10分）.
1. If you are u__________ of something, you do not know it is happening.
2. When a person is angry, he may be a__________.
3. You can’tb________ a bar of steel easily without a tool.
4. He made some g_________ to express what he wanted.
5. We should avoid s________ at people because it is bad manners.
