---I didn’t pass the Maths exam last time. I’m so worried about it. --- harder, you will make much progress .
—Will you buy the white watch or the red one ? ----I’ll take_____.One is for my mother and the other is for my sister.
—What is he going to ______ when he ______ up? —He’s going to be a doctor.
I had _____useful umbrella when it rained.
—Jim, remember to return this book by Friday. — .
The book won’t until the end of the year.