Now our school is four times ________ it was twenty years ago.
The tiger, once a ____ animal to humans, is now ____ of disappearing on the earth.
We shouldn’t spend our money testing so many people, most of ____ are healthy.
I won’t see the film tonight. I am busy. ______, it is raining cats and dogs.
Computers in offices and homes since 1970s.
More attention must be paid the endangered animals..