I think you should complain—_________ , of course, you are happy with the way things are.
| A．if | B．until | C．unless | D．once |
These teams, which _____twenty experienced workers, are working hard here to ___the time they have lost before.
| A．are made up of; make up of | B．are made up of; make up for |
| C．make up; make up for | D．make up for; make up |
The chairman thought ________ necessary to invite Professor Smith to speak at the meeting.
| A．that | B．this | C．it | D．him |
All day long， by the side of the road ______， looking at the passing cars and people.
| A．was he sitting | B．sat he | C．did he sit | D．he sat |
Eating too much fat can ______ heart trouble and cause high blood pressure.
| A．result from | B．attend to | C．contribute to | D．devote to |
It is always those ________ forgive first ________ achieve more happiness.
| A．不填; that | B．who; and | C．who; that | D．that; but |