China's present environment situation is from bad to worse and if we _________ now to protect the environment, we’ll live to regret it.
| A．hadn’t acted | B．haven’t acted | C．don’t act | D．won’t act |
32. Despite what I’d been told about the native people’s attitude towards strangers, ___
___ did I come across any rudeness.
| A．in no time | B．at no time | C．in any time | D．at any time |
31. Hillary Clinton arrived in Beijing yesterday, ______ the start of her short visit to China.
| A．marked | B．having marked | C．marking | D．to mark |
30·You can make a complaint to the local government____ you are happy with the way things are.
| A．unless | B．if | C．once | D．As |
29. ---- I wonder ______ Mr. Black changed his mind to take part in the movement.
---- After he listened to the speech by Mr. King.
| A．when was that it | B．when was it that | C．when that was | D．when it was that |
28. We finally managed to make the customers ______ of the quality of the vehicle.
| A．to convince | B．convincing | C．convince | D．Convinced |