托福口语词汇：formal和informal对照

　　informal         formal

　　freak out        get very nervous

　　bomb             do poorly

　　really good at   quite skilled at

　　learn tricks     develop strategies

　　ace              perform well

　　a clue           knowledge

　　lucky            fortunate

　　cool             calm

　　buddies          classmates

　　flunk            fail to give correct answers