| bacteria |
microscopic organisms that often play a role in the decay of living things, the process of fermentation, and sometimes in causing disease. |
| balloon |
a small bag made of thin material that is filled with air or some other gas and used as a decoration or toy. |
| click |
to make a slight, sharp sound. |
| direction |
control or guidance. |
| electric |
using or having to do with electricity. |
| gentle |
not intending to cause pain or trouble to other people or animals; kind. |
| knock |
to hit a door in order to make noise. |
| librarian |
a person who has special training to work in a library. |
| lick |
to pass the tongue over or along the surface of something. |
| nod |
to move the head up and down in order to greet or agree with someone. |
| people |
all persons who belong to the same community, country, religion, or race. |
| present1 |
the period of time between the past and future. |
| sick |
having an illness; not well. |
| vacuum |
a space or container in which there is no air or from which most of the air has been removed. |
| word |
a sound or group of sounds that has some meaning that other people can understand. Words are a basic unit of language. |