阅读下面材料。在空白处填入适当的内容(不多于3个单词)或括号内单词的正确形式。
W：Jack．how have your two sons been doing at school recently?
M：Don’t ask! Mark never starts studying，and Jason never stops    (study)．
W：You’re joking! I hear that Jason is likely (be)at the top of his class after exam this year．
M：Yes，so his teacher say．He’s been (work)very hard at his books every    evening for months on end recently．He is hoping to Harvard University．
W：Great．Maybe he’ll become a university professor (he)in the future．
M：Maybe．But sometimes I wish he'd go out and enjoy himself   change．
W：Yes…What about the younger one?
M：Well，Mark's teachers say he has abililty，but he(rare)does his best．He does his homework in ten minutes every day and then (rush)out to play football.
W: Perhaps he can make his fortune at football. People can make(plenty)of money from sports now．
M：My wife always worries about their future
W：Perhaps you can have a talk with him now to find out he is thinking about his studies and future plans．
M：Good idea．I'll take your advice．