30. In some countries, treatments for A(H1N1) flu were neither ________ nor effective, and many patients died because of infection.
| A．critical | B．scientific | C．necessary | D．Special |
____ the bike Smith had stolen ?
| A．Been | B．Did | C．Was | D．Had |
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 girl was frightened by the thief , and she stood there without ____ speak .
| A．daring to | B．daring | C．dare to | D．dared to |
Why did you keep it a secret from me ? I ____ about it .
| A．should be told | B．ought to have been told |
| C．should have told | D．ought to be told |
— You ought to have called her yesterday . — Yes , I know I ____ .
| A．ought to | B．ought to have | C．ought have done | D．ought to have called |