We must do everything we can ________ our earth cleaner and safer.

Why do you want a new job ____ you’ve got such a good one already?

There are roughly 1, 000 students in Grade Two, most of _____ are girls.

You look very beautiful in this dress andthere is only one of this kind left here. I wonder if youwould like to buy ______.

The salespeople said they hadn’t overcharged customers, but the police’s report showed that the practice did ______