—Is there anything wrong, Bob? You look sad.
—Oh, nothing much. In fact, I __________ of my friends back home.
| A．have just thought | B．was just thinking |
| C．would just think | D．will just be thinking |
You______be tired—you've only been working for an hour．
| A．must not | B．won't | C．can't | D．may not |
Father______for London on business upon my arrival，so I didn't see him．
| A．has left | B．left | C．was leaving | D．had left |
The success of this project______everyone making an effort．
| A．relies on | B．cares for | C．reminds of | D．suffers from |
When______，the museum will be open to the public next year．
| A．completed | B．completing | C．being completed | D．to be completed |
—Could you help me change the wheel，sir?
—______，madam，which one?
| A．With pleasure | B．Sorry，I can't | C．It's a pleasure | D．Just a minute |