14、add to 增加 add up to 总计达
15、in addition(to)=besides 此外
In order to master a foreign language，we should learn some grammar. In addition，we'd better learn some words.
17、 admit 供认
He admitted him mistake at last.考试用书
18、in advance 预先，提早
You should inform(告诉)me in advance if you are going to come.
19、take advantage of = make use of 使用
We can take advantage of computer to analyze data.
A good habit in learning is to make full use of class time.