They are busy______ready for the exam

What did the policeman say to you just now— He asked _______ when the accident happened.

He earned enough money to start his own business _____ offering guide services _____ tourists

It’s the fourth time that heavy smog(雾霾) has hit the city this month— It’s high time we _______ measures to fight air pollution

26.She ____ the hospital so soon, for she has not yet recovered.