David is the tallest student in our class. ______is taller than him.
These are my shoes. Yours ______ yellow.
—______ is this? —It's yellow.
There is a police car _____ the bus. The police are watching the traffic.
—Lily, here are your pens. Please _____. —OK, Mom.
—_____ do you have an art lesson? —Four times a month.