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