As time went on, people came to be ______ of the seriousness of China's population.
Mr. Smith was in great need of money, so he ____ $2 000 for his car.
Wearing dark glasses can _______ your eyes from the sun.
Nowadays everyone hopes to ______ good education so as to get a good job in the future.
In the west, people make _______ a rule to send Christmas present to their relatives and friends.
_______ was known to them all that William had broken his promise ______ he would give each of them a gift.