The old town has narrow streets and small houses ___ are built close to each other.
| A．they |
| B．where |
| C．what |
| D．that |
I don''t think it any use taking with him , you ____ as well leave him alone .
| A．might | B．must | C．can | D．could |
Why ____ you keep troubling your mother with such question while he is busy .
| A．can | B．will | C．would | D．must |
I''m surprised that he ____ to help me when I needed his help .
| A．should refuse | B．would have refused |
| C．should have refused | D．may have refused |
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 |