—Are these your sheep ?—No. Mine _____ on grass at the foot of the hill.

—What is on the desk?—There ____ a book and two pens on it. 

–What ___ the number of the students in your school?–About two thousand. A number of them_____ from England.

Over 20% of the students at that school _____ the habit of smoking, which is beyond imagination.

There _____a sports meeting in our school next week.