题目内容

It is known that hydrogen ____________ the lightest element.(is, was)

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Wehadmeanttotellherthenews,but ____________ shewasn'tin.(find, found)

Thescientistshavebeenmakingtheexperimentforhalfayear,butthey ____________yet.(haven'tsucceeded, hadn't succeeded)

Hiswife ____________ tocatchthelasttrain,butshewastoolate.(hoped, had hoped)

Thedinnerwasthemostexpensivemealwe ____________ (have ever had, had ever had).

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