Answer Key

Pre-test

You have already passed this section on 2015-02-17 at 1:29 scoring 100%.

Choose the correct form of the verb...
  1. It's a secret, so you  [mustn't] tell anyone, ok?
  2. It was difficult, but finally we  [were able to] make the machine work again.
  3. Sorry I missed your call. I  [must] have been in the shower.
  4. I'm not sure - I  [may have been] there with my parents when I was a teenager.
  5.  [couldn't sleep] , so I drank a glass of warm milk.
  6. That was unnecessary! You  [didn't have to] pay for it.
  7. Nobody  [was allowed to] leave the room until the police arrived.
  8. It isn't that important - you  [don't need to] do it right away.
  9. I don't know... that  [might] not be a good idea!
  10. I feel awful - I  [shouldn't] have eaten all those fried clams!