are many new central leaders in China now, ________ many once worked in the western provinces

The users of this new mobile phone can check emails________they happen to be. [ ]

Mary really hard on his book and thinks he’ll have finished it by Friday.

(2013·江西，26)There are a small number of people involved，possibly ________ twenty.

I want to know book it is.—Oh, it’s Xiao Wang’s.