Помогите пожалуйста с тестом по английскому Use the required form of the infinitive in...

Question

Помогите пожалуйста с тестом по английскому

Use the required form of the infinitive in brackets. Insert the particle to where necessary

1.I decided (to make) a fuss, and went (to look) for Rob​inson.
2. We walked to the door and I saw her (to go) in and down the hall. I liked (to watch) her (to move).
3. Let's (to go) and (to find) him, he's sure (to be) in front of his picture.
4. It's very interesting (to hear) you (to say) that.
5. Some important decisions must (to make) soon.
6.I think he must (to suffer) from inju​ry now.
7. You must (to dream) of it long.
8. Let me (to hold) the baby, Scarlett. Oh, I know how (to hold) babies.
9. She noticed that he seemed (to look) at the sideboard and with her engaging smile leaned forward.
10. But there is something else (to do).
11. "If you've got nothing to say," I said, "why (to try) (to say) it? Why not (to have) a little rest?"
12. There was one more announcement (to make).

Answer 1

1.I decided to make a fuss, and went to look for Rob​inson.
2. We walked to the door and I saw her going in and down the hall. I liked to watch her moving.
3. Let's go and find him, he's sure to be in front of his picture.
4. It's very interesting to hear you saying that.
5. Some important decisions must be made soon.
6.I think he must be suffering from inju​ry now.
7. You must have been dreamt of it long.
8. Let me hold the baby, Scarlett. Oh, I know how to hold babies.
9. She noticed that he seemed to look at the sideboard and with her engaging smile leaned forward.
10. But there is something else to do.
11. "If you've got nothing to say," I said, "why not to try saying it? Why not having a little rest?"
12. There was one more announcement to be made.

Answer 2

1.I decided to make a fuss, and went to look for Rob​inson.
2. We walked to the door and I saw her go in and down the hall. I liked to watch her move.
3. Let's go and find him, he's sure to be in front of his picture.
4. It's very interesting to hear you say that. 
5. Some important decisions must be made soon.
6.I think he must be suffering from injury now.
7. You must have been dreaming of it long.
8. Let me hold the baby, Scarlett. Oh, I know how to hold babies. 
9. She noticed that he seemed to be looking at the sideboard and with her engaging smile leaned forward.
10. But there is something else to do/to be done.
11. "If you've got nothing to say," I said, "why try to say it? Why not have a little rest?" 
12. There was one more announcement made/to be made.