—Is the letter from your mother?
—Yes.But she ________the letter herself，because she doesn’t even know one word.
| A．needn’t have written | B．can’t have written |
| C．might not have written | D．should not have written |
But for the help of my English teacher, I the first prize in the English Writing Competition.
| A．would not win | B．would not have won | C．would win | D．would have won |
The doctor recommended that youswim after eating a large meal.
| A．wouldn’t | B．couldn’t | C．needn’t | D．shouldn’t |
This printer is of good quality. If it _______ break down within the first year, we would repair it at our expense.
| A．would | B．should | C．could | D．might |
He did not regret saying what he did but felt that he it differently.
| A．could express | B．would express |
| C．could have expressed | D．must have expressed |
There was a lot of fun at yesterday’s party. You______come, but why didn’t you?
| A．must have | B．should |
| C．need have | D．ought to have |