Einstein’s theory, which was doubted by most scientists at first___out to be correct in the end.
| A．proved | B．was proved | C．turned | D．tested |
—Where have you been all day?
—I _______ some former classmates and I couldn’t get back until it was dark.
| A．have met | B．met | C．would meet | D．had met |
The process of producing electricity may also give out CO2, _______ you heat your house with electricity instead of charcoal.
| A．even if | B．as long as | C．as if | D．as soon as |
—How much of the foreign expert’s speech have you understood?
—Next to nothing. I wish I _______ harder at English.
| A．worked | B．had worked | C．would work | D．were working |
Don’t refer to the dictionary every time you come across a new word as sometimes its meaning may be _______ clearly in a given context.
| A．picked out | B．ruled out | C．brought out | D．taken out |
The Expo site should be _______ from anywhere in the city of Shanghai within 90 minutes by bus, subways and special taxis.
| A．adoptable | B．acceptable | C．available | D．accessible |