I don’t know if he ________ back tomorrow. If he ______ back, I’ll let you know.A. comes; will come B. will come; came C. will come; comes
_____ he is only 4 years old,he is able to play the piano very well.
Working hard ________ the key _________ success of everything.
We feel like ___________ the work as soon as possible.
The old man lives _______ in the countryside, but he didn’t feel __________.
He didn’t know English at all, so he can’t understand __________ the machine.