If you want to study the nature of the universe, first of all, you must be clear about its ________.
| A．traditions | B．consequences | C．signs | D．origins |
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 |
Hillary Clinton arrived in Beijing yesterday, ______ the start of her short visit to China.
| A．marked | B．having marked | C．marking | D．to mark |
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 |
---- 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 |
We finally managed to make the customers ______ of the quality of the vehicle.
| A．to convince | B．convincing | C．convince | D．convinced |