—Sorry. I’m afraid I can’t go to your party. I am busy with tomorrow’s test now. —________.
Could you please tell me _______?
I found ________ difficult to work out the problem without a computer.
---I don’t know what _____ if I do that. ---I think you ______ tell him the whole thing first.
---Why are you driving so fast? ---Because my flight is _______.
---Can you go shopping with me tomorrow? ---Sorry. I have to _____ my sick mother at home..