Having taken our seats, _______.
| A．the professor began the lecture |
| B．the lecture began in no time |
| C．we were attracted by the lecture immediately |
| D．the bell announced the beginning of the lecture |
When I was a child, my father ______ read me a story at night before bedtime．
| A．would | B．should | C．could | D．might |
She has bought herself ______ dress
| A．a cotton purple expensive | B．an expensive purple cotton |
| C．a purple expensive cotton | D．a cotton expensive purple |
Although the small room is the large one, it is more beautifully decorated.
| A．one- third the size of | B．the one- third size of |
| C．the size of one-third | D．one-third of the size |
Wind power is an ancient source of energy we may return in the near future.
| A．on which | B．by which | C．to which | D．from which |
When changing lanes, a driver should use his turning signal to let other drivers know___.
| A．whichever lane he is entering | B．which lane he is entering |
| C．whichever lane is he entering | D．which lane is he entering |