Linda had her luggage________ an hour before her plane left.
| A．check | B．checking | C．to check | D．checked |
The last thirty years _____ the greatest number of laws stopping our rights and progress,until today we have reached a stage ____ we have almost no rights at all.
| A．saw;which | B．have seen;that | C．saw;where | D．have seen;where |
As the sea ice melts sooner each swimmer,polar bears are forced to come ashore earlier and face food shortages _____ they have stored enough fat to last them through the season.
| A．before | B．unless | C．since | D．until |
—What did he want to know,Anne?
—_______I could finish writing the report.
| A．When it was that | B．It was when that | C．It was when | D．When was it that |
Ladies and gentlemen,please fasten your seat belts,the plane______.
| A．takes off | B．is taking off | C．is going to take off | D．is to take off |
Without facts,we can’t form a correct opinion,for we need to have actual knowledge____ our thinking.
| A．which to be based on | B．on which to base |
| C．which to base on | D．which to base |