_______ two exams to worry about, I have to work really hard this weekend

People working 10 or 11 hours aday are more likely to suffer from health problems than _____who go off dutyafter eight hours.

下列各句中，加线的成语使用恰当的一项是 (　　)

I’m certain David’s told you his business trouble it’s no secret that he owes a lot of moneyto the bank[ ]

hat you are chosen to be a volunteerat the London Olympic Games, what will you do