Plastic bags are provided for our convenience but they have also_______ the pollution of the environment．
| A．adapted to | B．turned to | C．contributed to | D．looked forwarded to |
.
We are looking forward with hope to ________ from Ms Smith.
| A．hear | B．hearing | C．heard | D．being heard |
.
Could you ________ the TV? I can’t hear clearly.
| A．turn up | B．turn on | C．turn down | D．turn off |
.
It ________ I arrived at the station ________ I found the train was delayed.
| A．was until; that | B．wasn’t until; that | C．was until; when | D．wasn’t until; when |
.
No teachers are permitted ________ in the classroom or in the office.
| A．smoke | B．smoking | C．to smoke | D．smoked |
.
---I’ll be away for about two days. Would you mind taking care of my little dog?
---________.
| A．Yes, it’s my pleasure. | B．Yes, I’ll do it well. |
| C．No, I’ve got no time. | D．No, I’d be happy to. |