根据句意和汉语注释，写出单词的正确形式。

小题1:The famous person often makes some ______________ (演讲)on protecting wild animals.

小题2:He feels happy by ________ (志愿) to work for the charity.

小题3:They have no money to afford________________(医学) treatment

小题4:They are very interested in these ________(发明).

小题5:He _________(表演) so wonderfully yesterday.

国际志愿者协会的缩写是（）。

A.IAVE

B.IAVD

C.IBVE