China’s oil price _____ very sharp increase during the year 2010 and it is continuing to rise further in 2011.
| A．observed | B．witnessed | C．proved | D．supplied |
When asked why he went there, he said he was sent there _____for a space flight.
| A．training | B．being trained | C．to have trained | D．to be trained |
— How is your son getting along with his work in England?
—Well. He’s ___ very easily to the new environments.
| A．adopted | B．adapted | C．adjusted | D．accustomed |
She is said _____in the United States for four years before she came back to work in our company.
| A．to study | B．to be studying |
| C．to have studied | D．studying |
I don’t know who invented _____digital camera, and it’s really _____ most useful invention.
| A．the; a | B．the; the | C．a; a | D．不填；不填 |