unit5 nelson mandela-a modern hero- speaking& writing测试 ⅰ.单项选择 1.i ________ him 100 yuan and must pay him back tomorrow. a.debt b.owe c.borrow d.lend 2.i don't want to join them on holiday.i can't ________ to spend money the way they do. a.afford b.allow c.manage d.permit