—You don’t seem to be quite yourself today. What’s wrong? —Oh, I’m suffering from a cold. Nothing serious, _____.
They were made ____ fourteen hours a day.
Why not ____?
The headmaster’s words are quite _____.
--Do you often hear John ___ in his room? --Yes. Listen! Now we can hear him ___ in his room.
The scientist suggested ____ the experiment in a different way.