Jack is a good friend _____, he often comes to our home for a visit.

What way are you thinking of _____ rid of the flies? 

We must do something to _____ factories _____waste water into the river before it is cleaned.  

"_____ of them are not here." means "_____ of them are not here."  

--How did you do in the test?  

--Not so well. I _____ much better but I misread the directions for Part D. 

Mary cares about clothes too much, and she _____ too much money _____ clothes. 

Our kind teacher wanted to teach us _____ he knew athis lesson. 

They started early that morning in order that they_____ there before noon. 

Is this research center _____ the foreign guests visited last week? 

--What is the model plane look like? --Well, the wings of the plane are _____ of its body. 

The enemy troop suddenly took the small village by surprise _____ a rainy morning. 

This is the school _____ they visited last year and is the one _____ my father once worked.

The college entrance examination is coming, the students are _____ it. 

The task was very hard, so _____ were needed.  

He wanted to read more, so he asked his friend if there was _____ to read.