—I don’t care what the teacher thinks. — But I think you _______.
— Kitty, do you know ______?— Sure, about forty minutes.
The mobile phone has changed people’s life a lot ________ it was invented.
I have so much homework to do that I don’t know ________.
---- You don't know what great difficulty I had _____ to get the two tickets.---- But the film is really worth_______ twice.
— You should be careful when ________.— Yes, I will.I’d like to know when ________ to have a rest.