5) chemical
A. adj. of, connected with, used in, or made by chemistry
B. n. a substance which is an element or a combination of elements
6) key
A. adj. very important or essential
B. n. something that provides access, control or understanding
2. 1)A 2)B 3)B 4) A 5) B 6) A
7)B 8)B 9)B 10) B 11) A 12) B
1) A. continue in a certain state
B. remain or continue in the same place; not depart or change
2) A. the body organ that pumps blood through the body
B. the central, innermost or most important part of something
3) A. have as a necessary part or result
B. include or affect (someone/something) in its operation
4) A. help to grow or develop
B. make (someone) feel brave enough or confident enough to do something, especially by giving active approval
5) A. give work to somebody, usually for payment
B. (format) make use of
6) A. person's way of looking at life, etc., mental attitude
B. what seems likely to happen; future prospects
7) A. one after the other
B. as a result of something
8) A. feeling that one would like to sleep or rest
B. having lost interest or patience
9) A. without any companions
B. (folowing a noun or pronoun) only; exclusively
10) A. a set of instructions for preparing a particular kind of food
B. (used in the expression "be a recipe for") be likely to cause a particular result
11) A. in spite of that; nevertheless
B. in a greater amount or degree, even
12) A. any of the foods that are combined to make a particular dish
B. a quality or qualities you need to achieve something
3. l) fit
Healthy and fit both indicate that a person is physically strong and rarely suffers from any physical illness. Healthy also refers to conditions which are good for somebody's health, or the outward signs of somebody having good health. Fit suggests that someone is in good physical condition particularly as a result of taking regular exercise.
2) technology
technique: [C] a specific way of doing something, usually involving some skill technology:
[U] the general use of scientific knowledge for practical purposes
3) efficient