Fill in the blanks with the correct prepositions: What ... having dinner at Mr.Tom's house this evening?

Fill in the blanks with the correct prepositions.
1. What ________ having dinner at Mr.Tom's house this evening ?
Write the correct form of the words give in brackets.
1. Two _________ from the group " Friend of the Earth" are talking to the students in this school about how to protect the enviroment. ( represent )
2. Enviromental _________ is every one's responsibility ( protect )