1. The wedding present bought last week        (据说花了她) a large amount of money. is said to have cost her
   
    2. It was          (直到他到达车站) that he realized he had left his ticket at home. not until he arrived at the station.
   
    3. Without the computer,        (我们不可能取得) such great medical advances in the last few decades.  we could /would not have made /achieved.
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    4. Our teacher demanded that we        (尽可能保持安静) when we visit the monument.  (should) be /keep as quiet as possible /as we can
   
    5. There is        (试图减肥没有意义)，unless you practice every day.  point/ sense in trying to lose weight.