Life is like _________ ocean; only ________ strong-willed can reach the other shore.
| A．an; a | B．an; the |
| C．the; the | D．the; a |
_____, Carolina couldn't get the door open.
| A．Try as she might | B．As she might try | C．She might as try | D．Might she as try |
Either you or one of your students___to attend the meeting__ tomorrow.
| A．are; to be held | B．is；being held | C．is; to be held | D．are；having held |
The most impressive sight in China，one of the wonders of the world，_____ the Great Wall.
| A．is | B．are | C．was | D．were |
The factory used 65 percent of the raw materials,the rest of whichsaved for other purposes.
| A．is | B．are | C．was | D．were |
—Why does the lake smell terrible?
—Because large quantities of water_______________.
| A．have polluted | B．is being polluted |
| C．has been polluted | D．have been polluted |