1 . 他观察这些动物的时间越长，他就越了解它们。(the＋比较级，the＋比较级)
____________________ he spent observing these animals，____________________ his understanding of them grew.

4 . 吸烟有害健康，每年因抽烟而丧命的人是死于交通事故的7倍。
Smoking is harmful to people’s health, killing ________________ traffic accidents.

5 . 我们投入的时间和精力是其他同学的两倍，所以我深信老师们会高度评价我们的项目。
We devoted________________, so I was greatly convinced that our project would be highly thought of by our teachers.

7 . 人类共同保护我们的地球家园的时代到来了。
________________ we human beings work together to protect our homeland — the Earth.

9 . 它几乎是我初中的四倍大。
It is ________.