---How long are you staying?
---I don’t know. ___________.
| A．That’s OK. | B．Never mind | C．It depends | D．It doesn’t matter |
It’s notgood idea to drive for four hours withoutbreak.
| A．a; a | B．the; a | C．the; the | D．a; the |
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 |