— Who’s that man in our classroom? It ________ be Mr. Brown. He is much taller.— You mean the man in white? He is an exchange student from England.
If there are ____trees, the air in our city will be ____cleaner.
Before the police , the alien left the shop .
We didn’t know the good news ______ he told us.
There _________ a computer in everyone's house in the future.
My sister can’t cook, I can’t, ________ .