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（编辑：雨巷）