代词：人称、物主、反/自身、指示、相互、疑问、不定代词
As they were classmates, ________ was no wonder that they should do the work in the same way
| A．This | B．That | C．There | D．It |
How can they learn anything ______ they spend all their spare time watching television?
| A．when | B．though | C．while | D．before |
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 |