Complete each sentence with the correct form of the word given in brackets. Then press "Check" to mark your answers.
  1. An African legend suggests that coffee was discovered after an Ethiopian shepherd noticed that his sheep stayed awake all night after (graze) on coffee cherries.
  2. The mountains in the north of Chad would be a (challenge) climb for the adventurous if they weren't off-limits due to possible guerrilla activity.
  3. The students were really (enthuse) about visiting the chocolate factory for a tour.
  4. Scientists estimate that laughing 100 times is (equal) to a 10-minute workout on a rowing machine or to 15 minutes on a stationary exercise bike.
  5. In a large bureaucracy, there is often not enough (account) to ensure good service.
  6. Kitty Treat will keep your cat (health) and happy for years to come.
  7. I know I made a mistake. Stop (needle) me.
  8. Takanohana dominated the Japanese sumo wrestling scene in the mid-1990s, winning four of six annual (tournament) and finishing second in a fifth.
  9. William Burroughs once joked that after one look at this planet, any visitor from outer space would say, "I want to see the (manage)."
  10. When egg white is beaten, it becomes foamy, (increase) up to eight times in volume.