She showed me the dictionary ____ she paid a lot of money
A by which B to which C for which D on which

I have many books, the best ______ was borrowed by Mary.
A about them　B of which　C among them　D in which

 Matter is anything ______
Ahat take up space and have weight          B which take up space and have weight
C that takes up space and has weight           D those take up space and have weight

Oxygen is a kind of gas, ______ we couldn’t live.
Awithout itB without that C without which　D if not

 She wrote a letter to her father, ______ she made her secret known
A which B that C in which D where

China has hundreds of islands, ______ we all know.
Ain which　B at which C of which D which

Rober is good at language, ______ we all know.
A because B for C as D since

 Don’t do such things ______ you are not sure about
A that  B which  C as D what

 The professor has two sons, ______ are teaching in the same university
A neither of them   B either of them          C both of them          D both of whom

 Don’t trust such men ______ over praise you to your face
A as  B that C who    D which