The old man __________ in Tibet for two years as a volunteer teacher；it is an experience he often mentions.
| A．served | B．serves | C．is serving | D．has served |
14．-The weather isn’t good enough for an outing，is it?
-To much dust．We can’t have__________at this time of the year．
| A．a worse day | B．a worst day | C．a nicer day | D．a best day |
13．Subway Line 4，__________into use in September 2009，has made traveling in Beijing easier．
| A．having been put | B．putting | C．being put | D．Put |
12．-Tom，you are smoking again?
- ________? It’s none of your business．
| A．Why not | B．what for | C．So what | D．How come |
11．Some great people said it was their primary school teachers that they were fond of_____influenced their whole lives．
| A．what | B．who | C．as | D．Which |
10．His story of the accident does not make any____________．He is telling a lie．
| A．difference | B．sense | C．excuse | D．Point |