1．p (n.)a cloth bag filled with soft material that you put your head on when you are sleeping
2．w (n.)the soft thick hair that sheep and some goats have on their body
3．f (n.)hot bright burning gas that you see when something is on fire
4．c (n.)a large natural hole in the side of a cliff or hill，or under the ground
5．r (adj.)someone or something can be trusted or depended on
