____ on ten years of observation and study, the story shows that everyone dreams every night, whether they realize it or not.
Wait till you are more ________. It’s better to be sure than sorry.
The hotel ____ 50 yuan for a room for the night.
You can take as many books as you like here for they are free of ________.
The army officer ___ his men to fire as soon as the enemies came up.
He made a living ___ teaching.