Space exploration began in the 1960s, and since then about five hundred people into space.
A. have traveled B. traveled C. had traveled D. are traveling
Not until the man i，n black took off his dark glasses that 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. He to 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 else in 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
Evidence has been piled up drinking water before breakfast is good for our health.
A. what B. which C. if D. that
