—Look! Smiths are playing basketball —Let’s them.
I haven’t seen Li Hong for a long time. I don’t know ______.
—Ann has finished her homework, hasn’t she? —Yes. She _____ it an hour ago.
—Is your brother at home? —No. He ________ the library. He hasn’t come back yet.
We know that about seventy percent _____ the earth _____ covered by water.
you drive,you will be.