----Shall I invite Ann to my birthday party tomorrow evening? ----Yes. It’ll be fine if you______.
Tom,Bob and Betty have arrived, but ___ students haven’t yet.
He has three pencils.____ is red, ___is blue, and ____ is green.
.She has three brothers.___ is a doctor, ___ are PLA men.
I have two bicycles, ____ is made in Guangzhou;____ is made in Shanghai.
___ took them quite some time to finish the job.