11.  The germs of influenza can only exist in an acid condition, he explained.

12.  She only brought one bag!

13.  Although Jack had already told me that he loved music, but because of stereotype, I thought the guy like he should only like rock music rather than light music.

14.  Remember our university not only needs smart girls.

15.  This class seemed to be a boring lecture on calculus that only a few people were actually listening.

16.  In my eyes, long hair only belongs to female.

17.  It was commonly considered that they were innocent with the outside world, and could only do well in the test.

18.  In their mind, only those who have tendency of abusing themselves would take courses of their department.

19.  He said that only by join in the Students' Union would we really be involved into the whole class.

20.  '\