______ regular exercise is very important,it's never a good idea to exercise tooclose to bedtime.(2011 .天津)
| A．It |
| B．As |
| C．Although |
| D．Unless |
—Guesswhat!Icameacrossanoldfriendatthepartylastnight.
—____________！I’msureyouhadawonderfultime.
| A．Soundsgood | B．Verywell | C．Allright | D．Hownice |
______ around the cultural relics for almost an hour, we got together under a big tree for a short break.
| A．Having shown | B．Having been shown |
| C．To show | D．To be shown |
---He ought to have been warned of the danger.
---_______, but he wouldn’t listen to me.
| A．He did | B．He should | C．He ought to | D．He was |
---You may find the key to the maths problem on page 107.
---Ah, it’s so simple. I wonder why I ________ of that.
| A．didn’t think | B．haven’t thought | C．wasn’t thinking | D．hadn’t thought |
----You seem to have known Dr Smith for a long time.
---- That’s true. ______ he joined our club six years ago.
| A．Since | B．Until | C．When | D．Before |