v. to cut or damage a surface on your skin slightly with or on something sharp or rought
I scratched my knee when I fell onto the sidewalk.

adj. frightened
David pretended he wasn't afraid but he couldn’t hide his expression.

n. an area of land that is higher than the surrounding land
Hills are not as high as mountains.

adj. not safe
It is dangerous to drive in a car without wearing a seat belt.

n. the middle joint of the leg that allows it to bend
I bumped my knee against the edge of the table.

n. a piece of soft thick cloth or rubber which is used to protect part of the body
The chair has soft padding to make it more comfortable.

vphrase. to be or move into a horizontal position on a surface
If you are feeling sick, please lie down and get some rest.

adj. not intelligent or sensible
David is never serious, he is silly.

n. a circular object connected at the center to a bar which is made for making vehicles or parts of machinery work
The wheels on this cart makes it easy to move around.

v. an object used for traveling over snow and ice and which has long metal strips on each side instead of wheels
The horses pulled our sled along the narrow path in the snow.