Answer:
1. Silvia doesn't like chocolate very much.
2. Silvia knows that her friends are going to throw her a party.
3. Silvia's friends bought her a chocolate cake.
4. Friends toast to Silvia with soda.
5. Silvia and her friends are going to eat ice cream.
6. Silvia's friends are going to serve him flan and cookies.
Explanation:
On this type of exercise you must choose whether the statements are 'true' (cierto) or 'false' (falso) according to a prompt (a text, a podcast, a video, etc.) Even though the prompt hasn't been included, perhaps the translation can give you a clearer idea.