Is the Maths problem ______ —Yes. I can work it out ______.

My father works in a ________．His students like him very much．

Do you know if he__________ back tomorrow— Sorry, I don’t know. If he__________ back, I will tell you at once.

How you deal with the misfortune when faced with it can truly ____ your character.

Is it a wonder that _____ little cells canstore _____ much energy