【小题1】The girl looks beautiful in the shiny (shine) red silk.
【小题2】Jay sang the songbeautifully (beautiful).
【小题3】The water in the river isharmless (harm). You can drink it without cooking.
【小题4】Can you tell me the meaning (mean) of this word?
【小题5】The Green family had a delightful (delight) holiday last week.
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解析：
【小题1】shine本身为名词，这里需要的是adj，故答案为shine.
【小题2】这里需要的的修饰sang 动词的副词，故答案为beautifully
【小题3】这里需要的是harm的反义词，同时还需要名词，因此变成harmless
【小题4】mean为动词，在此需要的是固定搭配：the meaning of .
【小题5】这边需要的是一个形容词，修饰holiday .