题目内容：

请认真阅读下列各个小题，并根据上下文语境和所给首字母的提示，写出下列各句空格中的单词，注意保持语义和形式的一致。请将答案的完整形式写在答题卡上相应题号的横线上。

1.— Why have you been so restless these days?

— Air tickets are in shortage. We are struggling to get seats on a plane b____for Mexico.

2.— Susan, do you know the meaning of “Brexit”?

— Yes. It refers to Britain exiting from the EU, namely, the s ____ from EU.

3.— Have you heard of the famous translator Xu Yuanchong, who is still devoted to his work at the age of 98?

— Absolutely! C____ his age, he leads a very active life.

4.— To fit in the new working environment and master professional skills, Jason attended a night school.

— The new job gave him passion and added a new d____ to his life.

5.— With the rise of online stores, numerous physical stores have been closed down in Suzhou. — It is the law of the j ____ . You have to be strong enough to succeed.