— Why didn’t you come to Mike’s birthday party yesterday?

   — Well, I _______, but I had something important to do at the moment.

   A. should                      B. must                                C. should have                   D. must have

––Why didn’t you come to the party?

   ––I had meant _____, but something unexpected happened.

  A. so                     B. that             C. not              D. to

12. -- Why didn’t you come to see the film with your parents last weekend?

-- I _____ my lessons for the month- exam.

---Alice, why didn’t you come the other day ? .
---I______, but I had an unexpected visitor.

—Mike, why didn’t you come yesterday?

—I __________, but I had an unexpected visitor.