Butterflies________a sweet liquid produced by flowers，which bees and other insects collect. (2013·湖北，25)
| A．carry on | B．feed on |
| C．put on | D．focus on |
Look out! Don’t get too close to the house _________ roof is under repair.
| A．which | B．whose |
| C．of which | D．of that |
The English play _________ many students are preparing at the New Year’s party will be a great success.
| A．for which | B．at which |
| C．in which | D．on which |
There was a time _____Soapy had to beg from door to door to make himself alive.
| A．when | B．that | C．while | D．how |
Because the shop _________, all the T-shirts are sold at half price in it.
| A．has closed down | B．closed down |
| C．is closing down | D．had closed down |
He has attended the Olympics Games three times, so he has the _________ of rich experience.
| A．advantage | B．use |
| C．benefit | D．interest |