15．The book Been There, Done That written by a Chinese Americangraduate is _____a real story.

Some people believe _______ has happened before or is happening now will repeat itself in the future

Inour school library there anumber of books on science and the number of them growinglarger and larger.

下列加点词语意义和用法相同的一项是

Do you know the girl is talking to your teacher —She is my new classmate Sarah.