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
If you commit a crime, you will ____ punishment.
A．desire B．deserve C．demand D．desert
The victims of the accident demanded that the case ______ at once.
A．would be looked into B．should look into C．be looked into D．look into
