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 |
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34．He glanced 
at the note，_______and went on with the meeting．
| A．turned it down | B．gave it out | C．brought it on | D．put it aside |
33．It was the first time that Mike______the piano at the concert hall and he hoped that his nervousness would go．
| A．played；unnoticed | B．had played；unnoticed |
| C．played；unnoticing | D．had played；unnoticing |
32．__________we get on well with a number of people，we are usually friends with only a few．
| A．While | B．Since | C．If | D．As long as |
31．____his membership card，Tony decided to make a phone call to check whether there was something wrong．
| A．Having not received | B．Not receiving |
| C．Not received | D．Not having received |
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