It is said that sixty percent of all energy ________ in the world today is being lost as wasted heat.
| A．produced | B．producing |
| C．to produce | D．having produced |
7. You should put on the notices ______ all the people may see them.
| A．where | B．in which | C．at | D．for them |
6. _____ I suggest, he always disagrees.
| A．however | B．whatever | C．Whichever | D．Whoever |
5. “Was his father very strict with him when he was at school?” “Yes. He had never praised him _______ he became one of the top students in his grade.”
| A．after | B．unless | C．until | D．when |
4 You will succeed in the end ____ you give up halfway.
| A．even if | B．as though | C．as long as | D．unless |
35. I had just stepped out of the bathroom and was busily drying myself with a towel ____ I heard the steps.
| A．while | B．when | C．since | D．after |