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420. keep a close watch on ( =keep a sharp lookout for) 密切注視

419. (be) keen on 喜愛, 渴望

418. junior to sb. 年紀(jì)較…輕, 職位較…低.

417. jump on (=scold, tell of) 叱責(zé)

416. jump at (=to be eager to accept)搶著接受,

415. be jealous of 妒忌

414. in itself 本身; of itself 自發(fā),自然

413. by itself (=alone, without help)單獨(dú)地,靠自己

412. be involved in (=become connected or concerned) 卷入, 參加

411. invest in 投資