_______ there are many different types of food, some animals spend their lives eating only one type.
| A．Since | B．Unless |
| C．Once | D．While |
The men got out and pushed the bus . But it ____ move , not one bit .
| A．couldn''t | B．wouldn''t | C．needn''t | D．shouldn''t |
The fire spread through the hotel very quickly but everyone ____ get out .
| A．had to | B．would | C．could | D．was able to |
It''s nearly seven o''clock . Jack ____ be here at any moment .
| A．must | B．need | C．should | D．can |
— Could I borrow your dictionary ? — Yes , of course you ____ .
| A．might | B．will | C．can | D．should |
I talked for a long time , and in the end I ____ make her believe me .
| A．could | B．can | C．must | D．was able to |