Every possible means to prevent the air pollution, but the sky is not still clear.
| A．is used | B．are used | C．has been used | D．have been used |
He lives in a big house ____ windows face south.
| A．of which | B．whose |
| C．that | D．which |
Family fights are the things ____I feel upset.
| A．which | B．about which |
| C．that | D．about that |
The____ teacher has much ____in teaching English.
| A．experience; experiences | B．experiences; experiences |
| C．experienced; experiences | D．experienced; experience |
The boss left Jack ____the company when he was in hospital.
| A．in charge of | B．in the charge of |
| C．take charge of | D．take the charge of |
The club members said it was one of the best compositions they____.
| A．hear | B．have heard |
| C．heard | D．had heard |