—How about going out for a break?—________. We've been working for three hours.
When I called at his home the other day, I found him sitting on an armchair,_____ in his hands.
These teams, which _____twenty experienced workers, are working hard here to ___the time they have lost before.
The chairman thought ________ necessary to invite Professor Smith to speak at the meeting.
All day long, by the side of the road ______, looking at the passing cars and people.
Eating too much fat can ______ heart trouble and cause high blood pressure.