Sharp objects should not be brought to school. 要点精析
1. stairs n. 楼梯，阶梯
She came slowly down the stairs.
He ran down the stairs.
2. block vt. 妨碍，阻塞
The road was blocked by a huge rock.
Please move your car,it block my way.
You'd better not the doorway!
3. least pron. 最少，最小
at least 至少
That, at least, is the theory.
And it works—at least in mice.
have a try.
Answer: at least
4. first aid 急救
I could help them if i knew more first aid knowledge.
They immediately gave him First Aid.
Everyone should know some Answer: first aid
5. kit n. 用具包，工具箱