It is necessary for us （) （动词 master 的合适形式) （我们有必要掌握)at least one foreign language.
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I feel it difficult （) （动词 pass 的合适形式)（感觉很难通过) the exam.
We find it difficult （) （短语 make money 的合适形式)to （发现做某事很难)support our family.
He didn't tell me （) （why is he late)（变成间接特殊疑问句).
She was happy because her son （) （动词 engage 的合适形式) to （和谁订婚)a beautiful girl.
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