The number of the people invited ____fifty, but a number of them_____ absent for different reasons.
--- How long are you staying? --- I don’t know.______________.
. In China, a number of people__________English now, and the number __________growing year after year.
. ____________ the dinosaurs disappeared still remains a mystery.
---We are afraid we can’t finish the work____________a month. ---Just take your time.
.The little girl was____________by a____________noise at midnight.