Shortly after the accident，two _________police were sent to the sport to keep order.
| A．dozens of | B．dozens | C．dozen | D．dozen of |
I''m surprised that he ____ to help me when I needed his help .
| A．should refuse | B．would have refused |
| C．should have refused to | D．may have refused |
A lion ____ only attack a human being when it is hungry .
| A．should | B．can | C．will | D．shall |
If you ____ me , I''ll give you some advice .
| A．listened to | B．will hear | C．will listen to | D．will listen |
He looks very tired . He ____ to bed too late last night .
| A．must go | B．must have gone | C．could go | D．didn''t go |
____ the bike Smith had stolen ?
| A．Been | B．Did | C．Was | D．Had |