1.I will give a talk tomorrow.I'm thinking about ___C___.

1.I will give a talk tomorrow.I'm thinking about ___C___.
A.what can I say B.how to say C.what to say D.how can I say
解析：
2.Do you know buy the book Harry Potter?
The book is __C__ popular that youcan buy it at any bookshop.
A.where can I,so B.where can I,such C.where I can,so D.where I can,such
解析：