--Where have you been?
--I in the heavy traffic. Otherwise I here earlier.
| A．got stuck; would have come | B．got stuck; was |
| C．have got stuck; would have come | D．had got stuck; would come |
The bus ____ at six, but it arrived an hour later.
| A．should arrive | B．had arrived | C．should have arrived | D．must arrive |
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 |