27. In the west-central region lived the Welsh, who spoke a Celtic language, and in the north lived the Scots, whose language, ______ not the same as Welsh, was also Celtic.
| A．though | B．unless | C．if | D．as if |
Even the best writers sometimes find themselves ___ for words.
| A．lose |
| B．lost |
| C．to lose |
| D．having lost |
The old couple often take a walk after supper in the park with their pet dog ___.
| A．to follow |
| B．following |
| C．followed |
| D．follows |
At the end of the day he is totally ___ and sleeps well at night.
| A．exhausted |
| B．exciting |
| C．exhausting |
| D．excited |
___experience, he is no more skillful than Alice in practical operation.
| A．As a result of |
| B．In search of |
| C．Through lack of |
| D．In terms of |
When we ___ electricity, we get heat from an electric heater.
| A．switch on |
| B．put off |
| C．turn off |
| D．carry on |