It's not easy to change habits，__________ with awareness and self-control, it is possible.
| A．for | B．or |
| C．but | D．so |
The officers narrowly escaped ___________ in the hot battle.
| A．have killed | B．to kill | C．to be killed | D．being killed |
. ___________ the letter, he went out to post it.
| A．Writing | B．Being writing | C．Having written | D．Written |
. Don't you remember ___________ ?
| A．seeing the man before | B．to see the man before |
| C．saw the man before | D．to have seen the man before |
. People couldn't help ___________ the foolish emperor in the procession.
| A．laugh at | B．to laugh at | C．laughing at | D．laughing on |
. We’re looking forward ___________ the photo exhibition.
| A．to visiting | B．to visit | C．to having visited | D．visiting |