______________ ，橡胶事业发展迅速，是我国第二大橡胶基地。
西双版纳傣族自治州
根据句意及首字母提示，完成下列单词拼写。
1. —Sorry, I’m late.
—That’s all r________.
2. —Are you a teacher, t________?
—Yes, I am.
3. This is Mary. She is my good f________.
4. I can s______ the ABC song.
5. Jeff is an English boy. Is he your b________?
钢材的性能取决于钢材的化学成分，与钢材的组织无关。( )
