a chemical substance that tastes sour and can sometimes burn the things that it touches
Be careful with that acid.

to do something that causes a change in someone's situation
Her lack of a college degree started to affect her self-esteem.

to be going to do something very soon
Hurry up, the show is about to start.

a substance created through a chemical process
You should always be careful which chemicals you mix together because you could create a dangerous reaction.

more than what is normal or expected
Having a part-time job will give you extra money.

to remove; to eliminate
For some people, it is difficult to get rid of extra weight.

to give an answer to a question or request
How did Sarah respond to news that Jack was leaving the country?

to cease or stop
The health department shut down the restaurant because the food was not safe.

the particular events and conditions that affect someone or something at a certain time and place
I've been reviewing the situation and I've decided that this really isn't a serious matter.

an increase in speed
Coffee or soda will speed up you heart rate.