Books of this kind well.
No one is allowed ______ in the classroom.
The rice made _____ possible to produce one-third more of the crop in the same field.
I regret ______ you that you will miss your flight if you don’t hurry up. You have only twenty minutes to go.
. ______ hard. You are sure to succeed!
There was a time _____ hunger was a disturbing problem in this area.