—Will you go to Hangzhou by _____ car? —No, I'll take _____ train.
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.
We’ll have a picnic if it ______rain tomorrow.