根据下面句子的意思及所给的汉语提示，写出空缺处的单词或词组的正确形式。
1. She was so tired that she fell ____________（睡着的）at her desk.
2. The machine didn't work. Some ____________（工程师）came to help with the mending.
3. He was too busy. He felt he couldn't ____________（抽得出）any more time off work.
4. We did some cleaning and ____________（扔掉）some old things.
5. Don't stand on chairs. Many people ____________（伤着自己）by falling off chairs.
