Lucy didn’t do well in this exam, ______ made her mother quite unhappy.
| A．that | B．it | C．which | D．this |
He insisted ______ alone in the mountain.
| A．on to live | B．on living |
| C．living | D．in living |
Xi’an was attacked by such a terrible smog _____ few residents had ever experienced before.
| A．which | B．and it was | C．as | D．that |
____ an important decision more on emotion than on reason, you will regret it sooner or later.
| A．Basing | B．To base | C．Based | D．Base |
The way _____ was thought of by him was similar to the way ______ we carried it out.
| A．that, in which | B．which, which |
| C．what, / | D．it, that |
You can not imagine what great difficulty we had _____ the home for the old.
| A．to set up | B．setting up |
| C．set up | D．to setting up |