Allow children the space to voice their opinions, ______ they are different from your own.
| A．as if | B．even if | C．unless | D．until |
The old teacher lay wide awake on his bed, __________ all the problems he had to deal with the next day.
| A．thought about | B．to think about |
| C．thinking about | D．having thought about |
—What kind of party is it? Need we __________?
—Yes. It's a very formal occasion.
| A．give up | B．dress up |
| C．mix up | D．turn up |
Increase the temperature of the gas and the gas will tend to __________.
| A．expand | B．spread |
| C．stretch | D．extend |
He exists __________ bread and water.
| A．on | B．in |
| C．by | D．with |
His whole school education __________ only 2 years because of his illness.
| A．added up | B．added up in |
| C．added up to | D．was added up |