On the table she found a piece of paper _______ some confusing symbols.
| A．which was written | B．that was written |
| C．on which were written | D．on that was written |
In this section, we will briefly describe possible ways of reducing the costs and risks ______ in doing this.
| A．involving | B．involved | C．to involve | D．being involved |
This practice satisfies people of high moral standards psychologically and materially and ______ encourages other people’s enthusiasm.
| A．on the contrary | B．in the meantime | C．from time to time | D．all at once |
______ city in Zhejiang Province, located on the river’s upper reaches, is believed to be ______ source of the dead pigs.
| A．The; a | B．The; the | C．A; the | D．A; a |
—Can I use your phone?
—______.
| A．By any means | B．My pleasure | C．With pleasure | D．Feel free |
I was really busy these days, otherwise I _______ to your birthday party last night.
| A．came | B．did come | C．should have come | D．would have come |