| bacteria |
microscopic organisms that often play a role in the decay of living things, the process of fermentation, and sometimes in causing disease. |
| busy |
doing something or working on something. |
| cage |
a space closed in by wires or bars and used to hold animals. |
| camera |
a device for making photographs. |
| cost |
the amount of money charged or paid for something. |
| finish |
to reach or cause the end of; complete. |
| fort |
a strong building used for defense or for soldiers to live in. |
| friend |
a person whom you know well and like and who likes you. |
| jet |
an airplane with engines that give off a flow of heated gases to cause forward movement. |
| lend |
to let someone use something that is yours. When you lend a thing to someone, you expect that person to return it to you. |
| microphone |
a device that changes sound waves into electronic signals. Microphones are used to make sounds louder or to broadcast or record them. |
| pair |
two things that are the same and are used together. |
| slip |
to slide suddenly on a slippery surface. |
| stamp |
to push down against a surface with a hard fast motion. |
| sweep |
to clear the floor of dirt or dust. |