Bird flu , a contagious disease of animals , is believed ____ by viruses that normally infect only birds and less commonly pigs , and rarely humans .
| A．caused | B．being caused | C．to be caused | D．to have caused |
It is the first time that Mr. Smith ________ Wenzhou and I’d like to show him around.
| A．visits | B．visited | C．had visited | D．has visited |
They believe that there is __________ in the world.
| A．no such a car | B．no such car | C．not such cars | D．not such car |
Jack decided to buy himself an iPhone 4 _______ it means standing in line all night waiting.
| A．so that | B．as if | C．even though | D．however |
________________of the students who took part in the military training（军训） is 450．
| A．A number | B．A lot | C．Lots | D．The number |
--- Oh ! I’ve just broken a window.
--- ______. I know you didn’t do it on purpose.
| A．Never mind | B．All right | C．That’s fine | D．Not at all |