Elephants have their own way to tell the shape of an object and _________ it is rough or smooth．
| A．不填 | B．whether | C．how | D．what |
The fruit _____fresh in his fruit stand sells well.
| A．looking | B．looked | C．look | D．to be looked |
------Do you mind if I keep pets in this building?
------_____.
| A．You’d better not, actually. | B．Of course not, but it’s not allowed here. |
| C．Great! I love pets. | D．No, you can’t. |
The speaker raised his voice but still couldn’t make himself ______.
| A．hear | B．to hear | C．hearing | D．heard |
The visiting professor gave us some advice, ____ of great help to our English learning.
| A．I think it is | B．I think which is | C．which I think is | D．which I think it is |
I shall never forget those years I lived in the country with the farmers, has a great effect on my life.
| A．that; which | B．when; which | C．which; that | D．when; who |