1.what did mrs.brunner say that sent percy rushing off?

Here is the REAL ANSWER. I may not have the book, but I am reading it from paper so please it is not my fault but please try it. If you have the book try looking in page 67-70. Percy was not feeling so well in the mood to talk to him because of the big argument.

1 Our dive program... 2 local dives 3 a annual... an Mediterranean ?

4 further afield, while our also 5 used all... 6 a Caribbean Sea 7  members and

Explanation:

1 Dive is an adjective to program so the participle diving is better.

2 Local (diving) excursions is more accurate.

3 The correct form of the article is an annual  and  a Mediterranean one refers to one of the local 'dives'.

4 Skip the afield replace while for and and also refers to something else that is not mentioned.

5 Used all wants to impress but it is better to note that the diving association works with charter boats.

6 The Caribbean Sea because there is only one.

7 Replace and for with.

But I´m sure there are more mistakes in this text...