-----Who ______ it be that hasn’t handed it in yesterday?
------It _______ be Bob. He handed it in yesterday.
| A．can; mustn’t | B．must; can | C．can; can’t | D．may; mustn’t |
Today we have chat rooms, text messaging, emailing...but we seem __________ the art of communicating face-to-face.
| A．losing |
| B．to be losing |
| C．to be lost |
| D．having lost |
As a punishment she was not permitted __________ part in any school activity in a week.
| A．taking |
| B．to take |
| C．take |
| D．to be taking |
I hurried to the airport only __________ the plane I was to take had just taken off.
| A．to find |
| B．finding |
| C．found |
| D．having found |
It is difficult __________ a best friend.
| A．finding |
| B．found |
| C．to find |
| D．find |
The play had been on for 10 minutes but I was still unable to find a seat __________.
| A．to sit |
| B．to sit on |
| C．sit |
| D．sit on |