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 or natural environment

　　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 throw away something

　　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 to be stated

　　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 rather than reason

　　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