She won’t go unless________.

The number of people present at themeeting_________about 1000 , a large number ofwhom _______ experts from abroad.

_________difficult questions the teacher is asking! Only a few students can answer them!

Did you see the film ______ was shown last night— Yeah, it was really wonderful.

Distinguished guests and friends, welcome to our school, _____the ceremony of the 50th Anniversary this morning are our alumni （校友） from home and abroad.