Identify the alternative that fills in the blanks in the following paragraph with the correct preposition:

May 1st we’re having one very special coming to join us here our facilities. I’m glad to inform you that Mr. Steve Wozniak will give us some support a variety of technology matters. the end of the afternoon, Mr. Wozniak has agreed to throw a small lecture where he’ll be answering some of your questions. If any of you would like to ask him anything, please write your question down a piece of paper and leave it my desk.