There is somebody knocking at the door. Who________ it be?—I’m not sure. It ________ be a postman.

Grandma Wang is ill .[ ]

I think teenagers should not be allowed to get car licenses.－I agree. They are not _______.

Now that their parents are dead, the poor boy doesn’t know ________ the money they left.

To ______ surprise, I got an A in my English test.