Mary _____ be in London because I saw her in town just now.
| A．mustn’t | B．isn’t able to | C．needn’t | D．can’t |
—I'm wondering why the visitors chose to stay with the local family.
—__________ real local life.
| A．Experiencing |
| B．Experience |
| C．To experience |
| D．Having experienced |
__________ the project on time, the staff were working at weekends.
| A．Completing |
| B．Having completed |
| C．To have completed |
| D．To complete |
So difficult __________ it to work out the problem that I decided to ask Tom for advice.
| A．I did find |
| B．did I find |
| C．I have found |
| D．have I found |
They are all __________ little children that you are not able to look after __________ many of them.
| A．so；so |
| B．such；so |
| C．such；such |
| D．so；such |
More TV programs, according to government officials, will be produced __________ people's concern over food safety.
| A．to raise |
| B．raising |
| C．to have raised |
| D．having raised |