Not knowing his address , she had some difficulty ________ his house.

Who would you rather _______ the watch?

-- Isn’t it time you _____ down to _______ your own things?
--- I’m sorry for the delay, Dad.

Many gases        in the atmosphere actually        heat energy that escapes from the Earth’s surface back to the earth.

At the news of the earthquake, the soldiers did what they could       the victims.  

Allen followed his customer across the yard and stood on the step of the house,        two shopping bags. 

Our English teacher, having explained to us how to design a project, allowed us a whole week’s preparation and then       the class.

Every day after I went home, if not _______ from work, I will go out for a walk with my wife.

Everyone in our class was working hard and doing what we could ______ a good college.

The ability _______ an idea is as important as the idea itself.