19．Vitamin D helps our bodies make a special chemical, and this special chemical,________,affects our brains, making us feel happy.
| A．in turn | B．in particular | C．in advance | D．in short |
The professor has ______ 11-year-old boy who has______ gift for dancing.
| A．a; a | B．an; the | C．an; a | D．the; 不填 |
That dog ought to be destroyed it attacks any more children.
| A．until | B．since | C．after | D．before |
So tired of corn-bread that he eats it with tears in his eyes.
| A．is he | B．he is | C．he was | D．was he |
—I want to tell you something.
—You what? I can't hear you're saying.
| A．why | B．what | C．that | D．where |
—Have you ever been to Australia?
—No. I’d like to, .
| A．even | B．though | C．too | D．meanwhile |