1, C-plough
2, A-parents
3, B-loved
4, A-hour
5, D-machine
6, C-mutual
7, B-had finished
8, D-Congratulation!
9, A-were having
10, D-golden
11, C-taking
12, B-flashingly
13, D-must
14, A-have to
15, C-ought not to
16, A-head
17, C-made
18, A-divorced
19, C-No, not at all
20, D-May I speak to Mr. Green?
21, A-inportant