Do you know the young man well?—Sure, we __________ friends since we met in Nanjing three years ago.

The box is too heavy to carry. What’s in it?—Oh, it is ________ books.

I am twelve and I like English. — Oh, really? I am twelve and Ilike English.

______ are my sister’s pencils and ______ my ruler.

I like the trip ______ the zoo. [ ]