pick up the tab - pay the bill or the cost of something

　　piece of cake - easy

　　play by ear - act spontaneously; without planning

　　touch on - mention a subject briefly

　　under the water - not feeling well

　　wait around - waiting in vain

　　wait on - attend as a servant;serve

　　well worth the trouble - it deseres the inconvenienceortrouble

　　pill it off - accomplish

　　pull one’s leg - make fun of somenoe in a playgul way;makesomenoe believe something that is not ture

　　quite a few - many

　　raise the roof -angry

　　center away - immediately

　　run for office - compete for an elected position

　　save one’s breath - to keep silent because talking wouldnotachieve anyting