28．— Is Mike going there by bus? — He ought to, but he ________ not. He likes riding his bike.

ere is less and less coal and oil,scientists are exploring new ways of making use of ______ energy, such assunlight, wind and water for power and fuel

How happy we are! The holiday we have beenlooking forward _______ at last.

Hi, John. Are you still a smoker—-.It’s two years since I stopped smoking.

I’m _________ the blackboard, but I can’t ________ the words on it.