| appall |
to cause to feel shock or horror. |
| competitor |
a person, group, or thing engaged in a contest. |
| copper |
a reddish brown metal that is one of the chemical elements. Copper is used to make pipes, because it does not easily rust. It is used to make wires, because it is an excellent conductor of electricity. It can be combined with other metals to make alloys such as brass and bronze. |
| coward |
a person who does not have the courage to face danger, pain, or something difficult. |
| deeply |
in a strong and serious way; intensely. |
| dread |
to be very afraid of. |
| efficient |
operating or working in a way that gets results, with little wasted effort. |
| existence |
the condition of being alive or real. |
| lame |
not able to walk well; disabled. |
| physics |
the science that deals with matter and energy, their qualities, and the relationships between them. It includes the study of light, heat, sound, electricity, and force. (The word is used with a singular verb.) |
| scrub |
to clean by rubbing hard. |
| select |
preferred over others. |
| structure |
a thing made up of a number of parts joined together in a certain way. |
| vent |
an opening through which a gas or vapor can enter, pass through, or exit. |
| width |
the length of something from one side to the other. |