— How is that, Blair?
— I wonder ______ it takes to be a good teacher beyond patience and a great knowledge of students.
| A．how is it that | B．how it is that |
| C．what it is that | D．what is it that |
I told your friend how to get to the hotel， but I perhaps I __________ have driven her there.
| A．could | B．must | C．might | D．should |
——My cat’s really fat.
——You____________have given her so much food.
| A．wouldn’t | B．couldn’t |
| C．shouldn’t | D．mustn’t |
Thank you for all your hard work last week. I don’t think we ____ it without you.
| A．can manage | B．could have managed |
| C．could manage | D．can have managed |
_______ he had not hurt his leg, John would have won the race.
| A．If | B．Since | C．Though | D．When |
If it were not for the fact that she_______sing, I would invite her to the party.
| A．couldn’t | B．shouldn’t | C．can’t | D．might not |