He is at work ,— — 两空

He is at work ,— — 两空 He is at work now.同义句 He father is( )work at the moment. 他有点害怕他的爸爸　he　is　a　little　——his father 两空 He is very careful when he is-----(on,at)work Where is John?he is p( ) still at work. 问一道题—My cousin is very clever but he doesn’t work hard at hi Mr Green isnot at work.He is （ ）vacation. he is at work now.改为同义句 Maybe he is at work 的同义句 he is good at math,but he is w＿ in English 空填什么 He is busy at work.能否改为he is busy working