The rise of oil prices made scientists search for new energy resources ______ oil．
| A．replace | B．replacing | C．to replace | D．replaced |
He did not regret saying what he did but felt that he _____ it differently.
| A．could express | B．would express |
| C．could have expressed | D．must have expressed |
Amy joined a painting group but didn’t seem to _______, so she left.
| A．show off | B．go up | C．fit in | D．come over |
____ is known to us all is that the World Expo 2010 will take place in Shanghai.
| A．It | B．What | C．As | D．Which |
I have reached a point in my life I am supposed to make decisions of my own.
A which B where C how D why
Nowadays people sometimes separate their waste to make it easier for it ______.
| A．reusing | B．reused | C．reuses | D．to be reused |