If you are able to talk to a friend over the telephone, you feel that you are close _____ the actual distance is not shortened.
| A．even if | B．so long as | C．if | D．as |
The hotel ____ me ＄50 for a single room during one night.
| A．took | B．cost | C．charged | D．paid |
Little ______ that we were watching his every move，so he seemed to be going his own way in this business.
| A．did he know | B．he didn't know | C．didn't he know | D．he knew |
When the woman was told that her husband had a car accident, her mind _____.
| A．ended up | B．made sense | C．blocked out | D．went blank |
Color-blind people often find it difficult to _____ between blue and green.
| A．compare | B．separate | C．distinguish | D．divide |
Scientists say it may be five or six years ______ it is possible to test this medicine on human patients.
| A．before | B．after | C． since | D．when |