.As is known to all,____ tiger is in____ danger of dying out.
In English class, our teacher often creates an environment _____ we are given the opportunity to solve problems ourselves.
“match between these two teams was exciting," said Federer, "and we hope to see ___second."
It is hard to say what kind of person he is.Sometimes he is very friendly; at other times he ___ be very cold.
In my opinion, ___ matters is not one’s looks, but one’s inner thoughts.
Not far from the school there was a garden, _____ owner sat in it playing chess with his grandson every afternoon.