Earth is believed ______ by an object the size of Mars at some point in the distant past before itssurface cooled.
He's unlucky,and he's always suffering____________ luck one after another.
If you ____________ stop smoking, you can only expect to have a bad cough.
--Paul, I'd like to have a talk with you at tea break. -- __________ Have what with me?
_________ some maddals came to live in the sea is not
--Nancy is not coming tonight. --But she ___________ !