—We don’t have enough books .What would you like to ?—How about two of us one?
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.
Computersin offices and homes since 1970s.
More attention must be paid ____ the endangered animals.