waste vt. 浪费；糟蹋
Don't waste the flour; there isn't much.
不要浪费面粉，没有多少了。

challenging  adj. 有挑战性的
Because the job was not challenging enough.
因为那份工作挑战性不够

beat vt. 打赢某人; 胜过某人
Our team was easily beaten. 我队被对方轻易打败了.

hooked  a. 着迷的
I am much hooked on Elvis Presley's song.   
我对猫王的歌曲非常着迷。