How do you think that he was an hour late on such a short journey?
The World War II made______ impossible for Einstein to go on with his research.
________! Our troubles will soon be over.
-----Excuse me. Is this the right way to the Summer Palace? -----Sorry, I am not sure. But it _______ be.
_______ you’ve got such a good chance, you might as well make full use of it.
----- ________ for the fire! ----- It's OK. I’ll be careful enough.