----What ________ the number of the students in your school? ---- About two thousand. A number of them _______ from America.
He was seen____________ the garden just now.
-How many ____________did you do yesterday? -Six Patients were ____________on.
Nothing will prevent us_________our dreams.
-Are you going to Shanghai for vocation? -Yes.We want you to_______us with some information about it.
All of us find_______necessary to take exercise every day.