New Words:
(1) Silent adj, 无声的
(2) Ought vi. 应该，应当；大概
ought to do sth 应该；应该做某事
ought to know better 应该懂得多一些
New Phrases:
(1) Get rid of 摆脱，除去
(2) Ought to 应该
(3) Be fit for 适宜的
(4) Had better (not) 最好(不)，不要加to
You'd better tell her everything.
You'd better not say anything.