Choose a, an, the or -- (if no article is used).
  1. Marc wants to buy bike.
  2. I want to buy bike I've seen in the shop window.
  3. dinner is at seven o'clock.
  4. You are not in position to do that.
  5. coffee keeps awake at night.
  6. Is vegetable magarine healthier than butter?
  7. He has always got good appetite.
  8. She has headache.
  9. They never watch English movies at home.
  10. She usually goes to school on foot.