--- Catherine, I have cleaned the room for you．
---Thanks．You _______ it．I could manage it myself．
| A．needn’t do | B．shouldn’t have done |
| C．mustn’t do | D．needn’t have done |
Space exploration began in the 1960s, and since then about five hundred peopleinto space.
| A．have traveled | B．traveled | C．had traveled | D．are traveling |
Not until the man i，n black took off his dark glassesthat he was the famous film star.
| A．did I realize | B．I realized | C．was I realized | D．I have realized |
—Do you think he can get the first prize for jumping?
—Impossible now. Heto do so, but he has just hurt his leg.
| A．has expected | B．is expected | C．would expect | D．was expected |
—Thank you very much for giving me a hand when I was in trouble.
—Don’t mention it. I only did what anyone elsein my place.
| A．must do | B．might do | C．would have done | D．can have done |
you’ve tried it, you can’t imagine how tasty the fish I cooked is!
| A．Unless | B．Because | C．Although | D．So long as |