In order to continue to learn by ourselves after leaving school, we must ______ learn how to study in the school now .
A man with a bleeding hand hurried in and asked, “Is there a hospital around ______ I can get some medicine for my wounded hand?”
The world’s elderly population will exceed(超过) ____ of children by 2060,when each group ____ to account for about one fifth of the population.
Everyone knows that _______ is dangerous to play with fire, but _______ is difficult is to prevent children from playing with fire.
My friend Mary is _____ beautiful girl and _____ girl everyone likes to work with.
—Do you let your kids travel by themselves at night? —________! It couldn’t be more dangerous.