According to the periodic table, still some elements undiscovered.
| A．there seem to be | B．it seems to be | C．it seems that | D．here seem |
---What are the police doing?
---They are _________the mountain ___________ the escaped prisoner.
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_________ to the efforts by the headmaster, I can go back to school now.
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Americans eat __________ vegetables per person today as they did in the 1980s.
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According to my grandparents, it is a good idea to eat chicken soup when you have a cold. __, scientists agree with them.
| A．Sooner or later | B． Once in a while |
C．To be exact | D．Believe it or not |
Wind power is an ancient source of energy we may return in the near future.
| A．on which | B．by which | C．to which | D．from which |