---Did they have a good time at the party?---Judging by their smiles, they _________ have enjoyed themselves.
It ___ to chat online all day long. You’d better do something else.
He has finished his work. ___.
At the foot of the hill ___ surrounded by trees.
--How often do you eat out? --___, but usually once a week.
The old man went into the room, ___ by his wife.