Tell Mary there is someone __________ for her at the door.

Earth is believed ______ by an object the size of Mars at some point in the distant past before itssurface cooled.

With temperature ______ so rapidly, we could not go with the experiment.

          in the fields on a March afternoon, he could feel the warmth of spring.

If you keep on doing stupid things like this, you'll get _______ someday!

When the man came in, gun in hand, we all stood there, ________.

I didn't imagine              a writer in my childhood.

In the reading room, we found him     at a desk, with his attention      on a book.

So many problems ________， he is having a difficult time.

— What made Tom scolded by the teacher?  — ________.