ill at ease - uncomfortable
　　in hot water - in trouble
　　in the air -uncertain
　　in the dark - keep someone without knowdge; information from somenoe
　　in the lone run - looking toward the future; eventually
　　ins and outs - all the details; the various parts and difficulties to be seen
　　iron out - remove the difficulties or find an answer for
　　jump to conclusions - arrive too quickly at a decision or opinion
　　keep an eye on - watch closely
　　keep one’sfingers crossed - wish that nothing goes wrong
　　keep on one’s toes - be ready for action; prepared
　　knock oneself out - make a great effort
　　learn the ropes - learn the rules and routines of a place or activity