某中学高三年级举行“家·国·天下——十八岁成人典礼”，下面是主持人的开场白的开头和结尾，请你补出中间部分。要求:①紧扣主题，语言表达简明、连贯、生动，有文采;②至少运用一种修辞手法;③80字左右。

尊敬的老师们、亲爱的同学们:

    今天我们将举行一场隆重的十八岁成人典礼!____。　　　　　　　　　　　　　　　　　　　　　　　　　　接下来，请尊敬的老师们见证我们成长的誓言!

某研究机构利用水池(4m×2m×1m)、土壤、芦苇、水管等材料设计了一个人工湿地系统图。若用无植物的相同模拟系统实验，则检测到（    ）

根据材料内容，从下面的五个选项中选出能填入文中空缺处的最佳选项，使短文意思通顺，内容完整，并将其标号填写在下面题号后的横线上。

                                                                        (C)

      If you think you're too shy and want to be a little braver, try the following. You can make it.

             There's no need to hide it. When they get to know you're a shy kid, they'll understand you better. This also helps you feel easier in talks.

              When you smile, people think you're friendly and easy to talk with. Remember that other people have feelings, too, and ①most people will stay away from an angry-looking face.

      Take one small step at a time. If you find it hard to start talks, say something nice about people around you.         Doesn't it make you want to keep talking to that person?

      Turn your attention elsewhere.         ②Don't waste(浪费) time worrying about your looks or whether people like you or not Don’t lose heart Each time after you say “hi” or smile at someone for the first time, say “I did it!” to yourself.        

Keep trying and one day you'll never be shy when you talk to others.