---How often do you call your parents?--- ,but usually once a week.
Are you ________ of the mistakes you made in your final English test?
Some of this heat near the earth’s surface _________ make electricity.
The cunning fox tricked the little rabbit _________ picking up the carrots in the field and then caught it.
You must keep ____ in mind _____ your are a student in this school and should obey the school rules.
A cook will be immediately fired if he is found _____ in the kitchen.