| bacteria |
microscopic organisms that often play a role in the decay of living things, the process of fermentation, and sometimes in causing disease. |
| carton |
a box made of heavy paper. |
| cost |
the amount of money charged or paid for something. |
| foam |
a mass of small bubbles that forms on the surface of a liquid. |
| lady |
a polite word for woman or girl. |
| lane |
a marked path for vehicles or people going in one direction. |
| microphone |
a device that changes sound waves into electronic signals. Microphones are used to make sounds louder or to broadcast or record them. |
| problem |
a question or condition that is difficult to understand or to deal with. |
| sin |
an act of not obeying religious law. |
| singer |
a person who uses his or her voice to create music either as a job or hobby. |
| sir |
a polite form of address for a man, usually used in place of his name. |
| soldier |
a person who serves in the army and who is not an officer. |
| tiptoe |
the end or tip of the toe. |
| trust |
to believe that someone is good, honest, or able to be depended on. |
| unfair |
against what is right or just. |