—Isn’t that your boss over there?
—No, it ________ be him. I’m sure he is in the office now.
| A．can’t |
| B．must not |
| C．won’t |
| D．may not |
You should be more careful, _______ you might meet with some accident.
| A．meanwhile | B．otherwise | C．although | D．however |
One _______ fact is _______ Crystal always keeps a toothbrush in his pocket for good luck when he is the host of the Academy Awards.
| A．little-knowing ; 不填 | B．well-known ; which |
| C．little-known ; what | D．little-known ; that |
. The UN is _______ countries that want to increase peace.
| A．made of | B．consisted in | C．made from | D．made up of |
--- I will go to your place at 3:00 tomorrow afternoon.
--- I’m sorry, but I ______ to Beijing by then.
| A．am flying | B．have flown | C．will have flown | D．will fly |
If you ______ the chat room ten minutes ago, you _______ what we were talking about.
| A．have joined ; will know | B．had joined ; would have known |
| C．should join ; would know | D．would join ; have known |