A lot of people don’t learn from their mistakes ______ they get hurt.
Nobody but doctors or nurses and those ______ by Dr Hu ______ to enter the patient’s room.
______ I am willing to help, I do not have much time available.
— What do you think I should do?— I think you should call him back ______.
— What time is it?— I have no idea. But just a minute, I ______ it for you.
In the opinion of some students, they don’t study for pleasure — their main ______ is to enter a famous university.