Learning to speak Chinese is a challenge, for it is often difficult for one foreigner to make himself easy________.
| A．understand |
| B．to understand |
| C．understood |
| D．understanding |
Only those who have the __________ to do simple things perfectly will acquire the skill to do difficult things easily.
| A．patience | B．patient |
| C．ancient | D．impatience |
You have no idea how she finished the relay race __________ her foot wounded so much.
| A．for | B．when |
| C．with | D．while |
The weather was __________ cold that I didn't like to leave my room.
| A．really | B．such |
| C．too | D．so |
The air is deadly polluted because some factories don't __________ the rules to protect the environment.
| A．appreciate | B．regard |
| C．honor | D．respect |
John received an invitation to dinner, and with his work __________, he gladly accepted it.
| A．finished | B．finishing |
| C．having finished | D．was finished |