every other - alternate
fall behind - lag; fail to accomplish something on time
fall through - fail to happen or be completed
far cry form - completely different from;a long way
feel like - have a desire or wish for
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