Mike didn’t go to bed         his father came back.

1. A.
   till
2. B.
   because
3. C.
   so
4. D.
   if

They didn't go to bed_____ the work was finished.

1. A.
   when
2. B.
   while
3. C.
   until
4. D.
   after

He didn’t go there yesterday, _______he?

  A. did   B. does   C. didn’t   D. doesn’t

Mary didn’t go to John’s birthday party because she ________.

  A. wasn’t invited         B. didn’t invite          C. isn’t invited

 Mary didn’t go to John’s birthday party because she ________.

  A. wasn’t invited         B. didn’t invite          C. isn’t invited