7.【单选题】在1872年《共产党宣言》德文版序言中，马克思恩格斯就指出，“这些原理的实际运用，正如《宣言》中所说的，随时随地都要以当时的历史条件为转移。”这表明（）。

The flight attendants must be able to keep the passengers calm in ____ emergency.

The captain has flown for 10 years. ____ have I.

Sue Brown is a stewardess and Sam Green is a ____ for their country＇s airline.

Cathie has read ____ French books.

I ____ he will get the job.

I fell ____ after such a hardworking week.

Would you like to ____ anyone to represent your class?

The actors ____ the kids with their enthusiasm.

There are ____ wine glasses in the bag so please handle it carefully.

Which one is correct according to the book?