21.Tom is a determined person. He never allows ______to lead him by the nose.
A. anyone B. everyone C. nobody D. somebody
22.—Hi, Lily. Don’t forget to watch I，m a Singer at 10:00 this Friday night!
—What a pity! I ______in a plane to Hainan for a meeting then.
A. will sit B. will be sitting C. am sitting D. sit
23.After graduation, Frank often thought of those who had helped him ______his school life.
A. of B. across C. at D. through
