| chemical |
a substance used in or made by a chemical process. |
| dust |
tiny, dry pieces of dirt or other material that is in the air and collects on surfaces. |
| fuel |
anything such as wood or gasoline that is burned as a source of energy. |
| learn |
to get knowledge about something through study or experience. |
| never |
not at any time; not at all. |
| pane |
a sheet of glass in a window or door. |
| protect |
to defend or keep safe from danger or harm. |
| quick |
happening very soon. |
| reply |
to give an answer. |
| short |
not long in size or time. |
| shy |
quiet and not comfortable with other people. |
| squad |
a small number of persons trained to work together. |
| tool |
a thing that is used to help a person do work and that is usually held with the hands. |
| treatment |
the way a person acts toward another person or thing. |
| umbrella |
a device that protects you from the rain. It has cloth stretched over a wire frame that is held up by a long handle. |