1) Harry was late going to Mona's house.
2) Harry was late going to Mona's house because he wasn't with his dad.
3) The children were ready to play a game.
4) Grandma was in the kitchen.
5) Suddenly, there was a scream.
6) Grandma was scared because there.
7) Grandma was scared because there wasn't someone in the garden.
8) It wasn't Alvin or Erlina because they.
9) It wasn't Alvin or Erlina because they were at the funfair.
10) It wasn't Alvin's dad!
Ответ: See above.