1.where→that/which或去掉where 2.where→which/that 3.√ 4.when→that/which或去掉when
5.that→where 6.去掉 there 7.that→why 8.that→which 9.which→where/in which
10.when→which/that或去掉 when 11.man后面加 who或that 12.students后面加who或that
13.which→that 14.who's→whose 15.去掉it