第一节：根据句意或所给首字母，写出单词的正确形式（共15小题，每小题1分，满分15分）
1. We need to do a ___________(系列) of tests before we do anything else.
2. This is a great event that ______________(关系) the future of our company.
3. The youth of today are ___________(狂热) about pop music.
