It was not until 1911, _______ the first vitamin was identified, _______ people realized the importance of it．
| A．when; which | B．when; that |
| C．that; which | D．that; that |
. One of the skaters talented enough to stop her is Asada, who _____ against her since they were junior skaters.
| A．would compete | B．is competing |
| C．has been competing | D．is being competed |
Britain announced tighter security measures this week, with plans ______ full-body scanners at Heathrow airport within three weeks.
| A．to use | B．to be using | C．being used | D．having used |
. Research findings show we spend about two hours dreaming every night, no matter what we ____ have done during the day.
| A．should | B．would | C．may | D．must |
．I felt sure that __________qualification, ability and experience, you are suited to the position we have in mind.
| A．on account of | B．in terms of | C．on the basis of | D．in the light of |
---Are you happy with this laboratory?
---Not a little. We can’t have__________.
| A．a worse one | B．such a worse one | C．a nicer one | D．such a nicer one |