ay find the key to the math problem on page 107—Ah, it’s so simple I wonder whyI _ of that

DIY is very popular now. It means you don’t need to ______anyone to do it.

I’m sorry the traffic is so heavy. —— Does that _____ why you are so late?

think hard work can ___ success in the end.

do you study for a test—I study_______ working with a group .