As a parent, you ought to set a better _____ to your children, who learn bad behaviors quickly.
She’s already an hour late, What _____to her?A can have happened B may happenC should have happened D may have happened
As it tuned out to be a small house party, we ____ so formally.
— The woman biologist stayed in Africa studying wild animals for 13 years before she returned. — Oh, dear! She ______ a lot of difficulties!
To be on the safe side, we should fill up the tank now, because we ______ run out of gas on the way.
There used to be a small school,___________?