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【答案】
(1)fast;must
(2)star;stand
(3)wasp;crisp
(4)task;ask
【解析】(1)first中st发/st/, 所给单词在fast, must的划线部分发/st/. 故答案为: fast, must.
(2)stick中st发音浊化/sd/, 所给单词在star, stand的划线部分也浊化发/sd/. 故答案为: star, stand.
(3)grasp中sp发/sp/, 所给单词在wasp, crisp的划线部分发/sp/. 故答案为: wasp, crisp.
(4)desk中sk发/sk/, 所给单词在task, ask的划线部分发/sk/. 故答案为: task, ask.