Charles entered New York University in 2009 and one year later to University of London as an exchange student
| A．sent | B．had sent |
| C．was sent | D．had been sent |
We suggest that they provide an effective warning system to ________ many of the disasters ________.
| A．keep; happening |
| B．prevent; from happening |
| C．stop; from being happened |
| D．prevent; from being happened |
She started as an office junior, and ________ became the director of the whole company.
| A．in surprise |
| B．in return |
| C．in turn |
| D．in time |
Freezing winter is harmful ________ orange trees.
| A．for |
| B．to |
| C．of |
| D．at |
The villagers were often in _______ clashes with each other in those years before the agreement was reached.
| A．interesting |
| B．peaceful |
| C．violent |
| D．spiritual |
He exists ________ bread and water.
| A．on |
| B．in |
| C．by |
| D．with |