Заполните пропуски в инструкции следующими словами
1. Be careful.
2. Petrol and 1 _______ are flammable.
3. Acid is corrosive.
4. TNT and dynamite are 2 _______.
5. Wear 3 _______ when you work with chemicals.
6. You must wear a hard hat on a 4 _______ site.