The old teacher lay wide awake on his bed, ___________ all the problems he had to deal with the next day. 

Charles Babbage is generally considered ________ the first computer. 

Which do you enjoy___your summer holiday,taking a part-time job or staying at home?

Having finished his morning work, the manager stood up behind his chair, _______ himself.

_________ after a long walk, Kate called and said she couldn't come to the party.