The coal miners in the coal mine for 10 hours before we came to their rescue.
| A．had trapped | B．had been trapping |
| C．had been trapped | D．would have been trapped |
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 |
__________ the early train, you'll have to get up ear-ly and rush in a taxi.
| A．Catching |
| B．Caught |
| C．To catch |
| D．Catch |
0bama was said __________ in a scandal, so he was like a cat on hot bricks.
| A．to involve |
| B．involving |
| C．to have been involved |
| D．having involved |