请根据要求改写下列各句，每空一词。

【1】It took workers nine days to build a Fire God Hill Hospital in Wuhan. (对划线部分进行提问)

________did it take workers to build a Fire God Hill Hospital(火神山医院) in Wuhan?

【2】My mother bought me a cool pair of shoes during the New Year.(改为感叹句)

________cool pair of shoes my mother bought me during the New Year.

【3】The new type of coronavirus is very terrible. People are afraid to go out. (合并为一句) The new type of coronavirus is ________terrible ________people are afraid to go out.

【4】Most older people don't know how they could use smart-phones properly.(保持句意基本不变) Most older people don't know ________use their smart-phones properly.

【5】Australian wildfires have killed more than 20,000 koalas.(改为被动语态) More than 20,000 koalas have ________by Australian wildfires.