Do you have plenty of friends in your school? 

I don’t know what ________ of students in that school is, but you can see there are _________ of bikes and e-bikes outside the gate.

– Your father looks tired! -- Yes, he worked for _________ after twelve o’clock. 

David lives on the ________ floor. It is too high, so he has to take a lift every day.

--The number of the students in our school       very big.--About 9         students.