—Who____ it be that is knocking at the door?
—It ____ be Father, but I’m not sure.
| A．can; must | B．can; may | C．must; can | D．may; must |
It was only after she had read the papers _______ Mary realized the homework before her was extremely difficult to complete.
| A．when | B．that | C．which | D．what |
Honestly speaking, I would agree with Cathy, though not __________.
| A．widely | B．entirely | C．possibly | D．finally |
The accident is my fault, so I had to pay for the damage ______ the other car.
| A．of | B．at | C．to | D．on |
---Joan, what _______ in your hand ?
---Look! It’s a birthday gift for my grandma.
| A．are you holding | B．had you held | C．do you hold | D．will you hold |
I ________ have watched that movie---it will give me horrible dreams.
| A．shouldn’t | B．needn’t | C．couldn’t | D．mustn’t |