用名词性从句改写下列句子
【小题1】How many stars are there in the sky? Children often wonder.
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【小题2】When and where will the meeting be held? We will discuss it right now.
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【小题3】He was ill in bed. He was absent yesterday.（用reason合并句子）
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【小题4】The moon travels around the earth. It is a truth.
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【小题5】How did he come up with the idea? This doesn’t matter.
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【小题6】How excited were they when they received these gifts? You can’t imagine it.
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