Not until I went to America _________ what kind of country it was.
| A．did I know | B．I did know |
| C．I didn't know | D．I could know |
It is reported that the US uses ______ energy as the whole of Europe.
| A．as twice | B．twice much | C．twice much as | D．twice as much |
— The weather isn’t good enough for an outing, is it?
— Not in the least. We can’t have __________ at this time of the year.
| A．a nicer day | B．a worse day | C．a worst day | D．so fine a day |
Do you still remember the key points that ___________ in his report? I don’t remember them all.
| A．referred to | B．were referred | C．he was referred to | D．were referred to |
When he was doing the software development project, he ___________ many problems that he had to solve on his own.
| A．came up with | B．came through | C．came across | D．came out |
____________ scientists will be invited to take part in this space flight.
| A．Two strong young Chinese | B．Two Chinese strong young |
| C．Chinese two young strong | D．Young strong two Chinese |