| bacteria |
microscopic organisms that often play a role in the decay of living things, the process of fermentation, and sometimes in causing disease. |
| biscuit |
a small, round-shaped bread for one person made with baking powder or baking soda instead of yeast. Biscuits are not usually sweet. |
| build |
to make something by joining together different parts. |
| buzz |
a low noise caused by something moving fast. |
| class |
a group of people, things, or animals that are similar in certain ways; kind. |
| favor |
something kind you do for someone else. |
| guest |
a person who visits another person's home. |
| pitch1 |
the throw of a baseball by the pitcher toward the batter, who tries to hit it. |
| ski |
to glide over snow wearing a pair of long, narrow, smooth runners attached to boots. |
| speaker |
a person who uses words to say things. |
| spine |
the set of bones that go down the center of the back of a human or animal. |
| tray |
a flat, open piece of wood, metal, plastic, or some other material, used to carry, hold, or show food, drink, or small things. It often has a low edge. |
| tricky |
using or marked by tricks or lies. |
| war |
a time of very great fighting between countries or groups of people. |
| win |
to do the best or come first in a game. |