orange key ring is Timmy’s. It’s present from Neil.
Though he thought math was very difficult, he never _______it ______.
—Mom, I wonder ________.—Baby, I think you should study harder.
_________ our earth less polluted, or we will lose our home.
—Can you lend me the novel ________ you talked about the other day?—Oh, you mean the novel from Liuliu. No problem!
_______ hard-working boys! They have already worked for 3 hours without rest.