Look at the glasses on the desk. Are they David’s?—They belong to him. I saw him go out with glasses just now.

Excuse me, will the plane for Beijing within an hour?—I’m not sure. You can go to the Information Desk for help.

There are ________ of students in our school, but only ______ are girls.

It _____ me more than one hour to read the book yesterday.

________ pencil cases do you have?—One. [ ]