The number of students in our school _______ 4,000 and a number of them ______ good at playing Ping-Pong.
After reading for an hour, you'd better_______ the green trees for a minute or two.
Do you need help _______ your Maths homework?
Which floor do you_______ this tall building?
-How many students are there in your school? -There are about eight_______ students.
-_______? -Yes. This is Kitty speaking.