---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 |
—What do you think made Mary so upset?
—_______ her new bike.
| A．As she lost | B．Lost | C．Losing | D．Because of losing |
When I handed the report to John, he said that George was the person _______.
| A．to send | B．for sending it | C．to send it to | D．for sending it to |
She looks forward every spring to _______ the flower-lined garden.
| A．visit | B．paying a visit | C．walk in | D．walking in |
A cook will be immediately fired if he is found _______ in the kitchen.
| A．smoke | B．smoking | C．to smoke | D．smoked |
It is said that in Australia there is more land than the government knows _______.
| A．it what to do with | B．what to do it with |
| C．what to do with it | D．to do what with it |