--- The box is too heavy to carry. What’s in it? --- Jack _______ it with many books.
There ______ a basketball match between Class One and Class Three this afternoon.
_________of the two boys is from America. They’re from Canada.
On ______ sides of the streets are a lot of colorful flowers.
We should not eat ________junk food.
---Could you please sweep the floor? ---___________. I’m washing the shirt.