Tony studies very ______.He often does his homework until 10:30p.m.,but his brother Tom______ does homework.
There are six floors _______ our school buildings. Our classroom is _______ the third floor.
--Would you like a glass of water? ---_________________.
Don’t eat ______ sugar, you will get _______ fat.
He never _______ hamburger _______ sweets.
--How many people are there in the city? --_______.