When the clock_________ twelve, all the lights went out.
| A．hit | B．beat | C．struck | D．knocked |
It doesn’t make a(an)_______to me whether you go or stay.
| A．difference | B．point | C．deal | D．effort |
How did it______ that humans speak so many different languages?
| A．come out | B．come off | C．come about | D．come round |
Eric was well prepared for the computer test so that he could be positive about passing it on his first________.
| A．intention | B．attempt | C．purpose | D．desire |
The dead rate is _____ pigs and recovery usually ______ within 7-10 days.
A low in; occurs B. rich in;happens
C. high in; came about D. poor in;took place
_____ three influenza type A virus subtypes(子类型) have been found in pigs.
| A．By far | B．As far as | C．So far | D．Till far |