—Are you in ___________? —Yes, I am.
—____ my pen? —Yes, I ___ it on your desk five minutes ago.
—_____ and see a film this afternoon? —That’s a good idea.
—Can you tell me ______? —By doing more speaking.
After school he didn't go home. ______, he went to the playground.
______ summer nights, we often go to sleep ______ the window open.