完成句子
It took Mike half an hour to work out the problem. (改为同义句)
Mike _______ half an hour ________ out the problem.
Tom won’t visit the farm. He’ll stay at home. (合并为一句话)
Tom will stay at home ____ ____ visiting the farm.
He keeps silent because he is sad. ( 对划线部分提问 )
____ ____ he keep silent?
With the help of Jane ,Kate passed the English exam. (同义句转换)
Kate passed the English exam  ____    ____ Jane’s help.