—Where is my pen? —Oh, sorry, I have taken________ by mistake.
The math problem is _______ difficult and _______ of them can work it out.
_______ of the students in our class _______ interested in micro blogs (微博) on the Internet.
_______ great fun it is to play games on _______ QQ!
---When will they ______? ---_______ the seventh of July.
---Your spoken English is much better now . --- Thank you. Our English teacher asks me _________ English as ______ as I can .