2的倍数的牌子是____(按题中牌子的顺序，填牌子上的数)

    When you talk to people in the training camp, you'll probably find that a lot of them are feeling just like you are. They're all new to the school and don't know what to ____ Talking about a common interest with your classmates can help you develop____

    The work in high school sometimes worries freshmen a lot. The work in high school gives you more knowledge of many subjects. So you may find it's a bit more challenging. If you ever find your work too difficult, teachers can ____ you.

    High school also has more after-school activities, such as music and theatre groups, sports teams and____. This is a good chance to learn how to be more independent. It is also a good time to develop your interests and try new things.

仔细阅读下面五个句子，然后用下面方框中所给的单词或短语填空，使每个句子在结构、句意和逻辑上正确。（提示：选项中有一个是多余的）

If you don't____ a flash, then it may be OK.

When it began to rain, Ben was helping his mom____ dinner.

It could be Mei's hair band. Or it might____ Linda. They both have long hair.

The British teacher is very____ . He always tell us interesting jokes.

If you are always____ from class, you will fail the examination.

某校七年级共320名学生参加数学测试，随机抽取50名学生的成绩进行统计，其中15名学生成绩达到优秀，估计该校七年级学生在这次数学测试中达到优秀的人数大约有（   ）