214486.（2020•西安中学•高二下期中）
Much ____ his surprise， the moment he went into the classroom， every one stood up clapping to congratulate him ___ winning the first prize．（ ）
220238.（2017•西电中学•高二上一月）
People should be cautious ______their personal information when surfing the Internet so as to prevent certain computer viruses ______ it．（ ）
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