----Have you known Professor Jackson in our department for a long time ? ----Yes, since he _____ the our university.

Sarah hopes to become a friend of _____________ shares her interests.

Was it in the school reading room _____ you found the missing book?

Mr White is ________ as one of the most excellent leaders in our company..

______ he told us is the news _______ China has got 32 gold medals in the 28th Olympic Games in Athens, _________, of course, made the nations feels very excited.