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

a covering for the eyes, usually worn when doing some dangerous activity
I put on my goggles when I went snow boarding.

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

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

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

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.

an organ in the body where food is digested
My stomach hurts from eating too much.

to ride on a wave as it comes toward land, while standing or lying on a special board
surfing is very popular in places like Australia and Hawaii.

a raised line of water that travels across the surface of the ocean, sea, or other body of water
There were huge waves because of the storm.

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.