One of our rules is that every student ________ wear the school uniform while at school.
| A．might | B．could |
| C．shall | D．will |
—Why does Thomas speak through every discussion but never listen to the others?
—That's what he ________ do. We used to hate that, but are used to it now.
| A．ought to | B．can |
| C．will | D．might |
________ the arrival of the police, I would have been robbed by two masked men.
| A．Had it not been for | B．If it were not for |
| C．Had it been not for | D．If it would not be for |
I know that it will be difficult to pick him out in such a crowd, but if you ________ happen to see him, give him this packet.
| A．would | B．might |
| C．should | D．could |
She didn't come to the party last Sunday. ________， she must have made the party more exciting.
| A．If she came | B．Would she come |
| C．Had she come | D．Did she come |