Ответ:
1 When I came into the classroom, the teacher was standing at the desk
2 I am busy now because I am making a lemon cake
3 George thinks it's difficult to learn languages
4 Most of all Greg wants to become a famous musician
5 I am hearing a nice melody. Who is playing the piano?
6 Sue loves her mom and dad
7 Yesterday at 5 o'clock when I was driving the car it suddenly stopped
8 I don't understand what the teacher is saying now
9 Yesterday I heard that Tom is married
10 My parents like to watch comedies