几道英语词性转换!1.I------(go)to Beijing before an international mee

1.I___have gone___(go)to Beijing before an international meeting__began____(begin)in September.I___have been invited___(invite)by CCTV recently.
2.Shanghai___has changed___(change)greatly in the past ao years.
3.Lost time__will never be found____(never,find)again.
4.This kind of motorcycle___is not needed___(not need)any fuel.
5.When____will__the leture___begin___(begin)?
I don't komw yet.
6.You ___are wanted___(want)on the phone,Miss Brown.
7.Why!My letter___has not been posted___(not.post)yet!