根据句意完成单词，在空格里写出恰当形式的英语单词，每空一词，将答案填在答题卡上。
61. In_________(conclude), I want to thank everyone who helped to make this event possible.
62. The companies were instructed not to expose people to _________(pollute) water any more.
63. Business leaders gave an ____________(enthuse) welcome to the proposal.
64. There is no ______________(possible) that he may be late.
