31.众所周知，指南针首先是中国制造的。(As)

32. 我们需要更多的练习是十分清楚的。(practice)

33. 你没听李老师的报告真是太遗憾了。(miss)

34. 碰巧我那天晚上有空。(happen)

35. 据提议试验应该在低温下做。(suggest)

36. 他已经做的事情与我们无关。(nothing)

37. 她问我花了多长时间建成这座大桥。(take)

38. 直到昨天我才知道他要来。(not… until)

39. 这城市不像三年前的那样子了。(used)

40. 这正是你要寻找的东西。(look)

31. As is known to all, the compass was first made in China.

32. That we need more practice is quite clear.

33. It is a pity that you missed the lecture made by Teacher Li.

34. It happened that I was free that evening.

35. It is suggested that the experiment should be made under low temperature.

36. What he has done has nothing to do with us.

37. She asked me how long it had taken to build the bridge.

38. It was not until yesterday that I knew he was coming.

39. The city isn’t what it used to be three years ago.

40. This is what you are looking for.

课程辅导：
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