After completing and signing it, please return the form to us in the envelope ________.
The boy is seriously injured. So he is supposed _________ to hospital as soon as possible.
So difficult did he find _______ to pass the driving test that he decided to give up.
I’m sorry that what I said just now has hurt you, but I didn’t do it _____.
---Why did you come by taxi? ---My car broke down last week and I still ________ it repaired.
There is no possibility, ________ can be seen at the moment, ________ we can win the game.