Sam         his homework yet, so he won’t go out with his classmates.

The theater        a lot since it was built two years ago.

I think      of the materials I listened to at the beginning of the exam      easy.

These children had fun        and        English.

It’s good       us       walk after supper every day.

We never        how to open the box.

—What do you usually do in your spare time, playing the violin or the piano?—I do        of them. I practice singing with some volunteers.

       human beings        animals can live without air.

—I haven’t had my breakfast.—      I.

—      the population of Hong Kong?—Seven million people.