Most whales must come up for air after several minutes, _______ a few can stay under water for an hour or more.
| A．while | B．or | C．for | D．so |
— Who dares to go ? How about you ?
— Sorry , I ____ .
| A．dare not to go | B．don''t dare to | C．don''t dare | D．dare not to |
It''s nearly seven o''clock . Jack ____ . be here at any moment .
| A．must | B．need | C．should | D．can |
Johny , you ____ play with the knife , you ____ hurt yourself .
| A．won''t ; can''t | B．mustn''t ; may | C．shouldn''t ; must | D．can''t ; shouldn''t |
— ____ he be at home now ?
— No . he ____ not . He ____ be in his office . He often goes home from work at almost twelve .
| A．Can ; can ; must | B．Must ; need ; can | C．May ; must ; must | D．May ; need ; must |
“That VCD you bought ____ very expensive” . “Do you know ____ ? ”
| A．ought to be ; how much it cost | B．may be ; how much it costs |
| C．must be ; how much it cost | D．can be ; how much doesn''t it cost |