He has known the truth. Therefore, there is no ____ to keep it a secret
| A．chance | B．doubt | C．possible | D．likely |
That is the reason _____I refused it.
| A．why | B．for that | C．because | D．which |
This is the factory _____my father worked ten years ago.
| A．where | B．that | C．which | D．for the which |
The conference has been held to discuss the effects of tourism ______the wildlife in the area.
A. inB onC. atD. with
Sorry, madam. You’d better come tomorrow because it’s _____the visiting hours.
| A．during | B．at | C．beyond | D．before |
---When do we need to pay the balance?
--- ____ September 30.
| A．In | B．By | C．During | D．Within |