In our school library, there _____a number of books on science andthe number of them _______growing larger and larger.
The boy wanted to keep a pet rabbit and his mother decided to buy ______ for him.
Hello, everyone! It's my great ______ to be here to make a speech. Thanks for your attention.
—Allen, please tell me what you are going to be when you grow up. —To be______ engineer just like you.
—Did you know ______ just now? —Their plane didn't take off on time because of the thick fog.
Do you know where Jimmy is? I ______ him for such a long time.