Here are the correct forms:
1. Eating seafood is healthy for you.
2. I can't stand eating garlic.
3. Sue decided to order lamb chops.
4. Dad bought some meat to cook steak for dinner.
5. I look forward to trying these apple pies.
6. Kate suggested ordering pizza for everybody.
7. I'd prefer to have chicken with rice.
8. Do you deny stealing the money? Yes or no?
9. I refuse to accept that there's no other way out.
10. The kids were pretending to be fast asleep.
11. I'm really looking forward to going away.
12. What would you like to do now?
13. How did you manage to persuade her to come?
14. They've run out of petrol and have to stop buying some.
15. I've just finished reading the novel.
16. This medicine didn't help. Try taking an aspirin.
17. I'd like to have a mixed salad, please.
18. I really enjoy eating pineapple.