C—
1. His behaviour dosen't make sense to me.
2. She's having problems getting all her work done on time.
3. He didn't reference anything about his new job when I last spoke to him.
4. If you don't take care of your belongings, you'll lose them.
5. Problems in the world economy had been damaging the industry last year.
6. Jim lost his temper and started shouting.
7. I have a reason for being annoyed.
8. She hasn't noticed the warnings from her friends.
D —
1. in
2. on
3. on
4. on
5. in
6. in
7. in
8. on
9. in
10. on
