It is said that sixty percent of all energy ________ in the world today is being lost as waste heat.
| A．produced | B．producing |
| C．to produce | D．having produced |
I regret that I am unable to help you .
| A．saying | B．say |
| C．to say | D．said |
In order not to , he spent the whole night preparing for the speech of next day.
| A．lose courage | B．lose heart |
| C．lose face | D．lose voice |
Can you ______ your sister from that group of girls?
| A．bring out | B．pick up |
| C．pick out | D．bring up |
In fact most people in that area are _______ than they were 5 years ago because of years of wars.
| A．poorer off | B．worse off |
| C．better off | D．richer off |
Missing the flight means _______ for another three hours.
| A．waiting | B．to wait |
| C．wait | D．to be waiting |