feel up to - feel well enough to or be capabele of

　　few and far between - not happening often； rate

　　figure out - determine； reason out by thinking

　　fill in for -take another's place

　　fill sb.in - tell what sb. should know

　　fish out of water - out of one's element ornaturalenvironment

　　flying colors -success，victory

　　for good - permanently； forever

　　for the time being - for now； temporarily

　　get away with - escape without punishment

　　get rid of - give something away； sell， destroy， or throwawaysomething

　　get the ball rolling - start something； make a beginning

　　get the hang of - understand； learn

　　give a hand - help

　　go without saying - understood； clear without needing tobestated

　　go off -begin to ring

　　hang on - keep hold of； persevere；keep doing something

　　hard to come by - difficult to obtain

　　have a heart - have kind feelings； be understanding

　　have a hunch - have an idea based on feelings ratherthanreason

　　hold off - delay；postpone

　　hop to it - get started on something quickly

　　hit it off - get along well with someone

　　ill at ease - uncomfortable

　　in hot water - in trouble

　　in the air -uncertain

　　in the dark - keep someone without knowdge； informationfromsomenoe

　　in the lone run - looking toward the future； eventually