This street is very crowded at this time of day.You have to be very cautious while ______.
| A．to drive | B．being driven | C．driving | D．having driven |
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 |
Though he had often made his little sister __________，today he was made __________ by his little sister.
| A．cry； to cry |
| B．crying； crying |
| C．cry； cry |
| D．to cry； cry |