【小题1】Ruth es from New York. (同义句)
Ruth is from How is New York.
【小题2】What’s the weather like today ?
are dancing Who is the weather today ?
【小题3】Many people are in the room.. They are dancing .(合并为一句)
Many people are having in the room .
【小题4】Tom is studying now .( 划线部分提问)
Studying now .
【小题5】They have an English class every day. (用now替换 every day )
They an English class now.
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解析：
【小题1】表示从某地来也可用用be from，本题的主语为单数第三人称，故本题空格处填is from。
【小题2】对天气提问也可以用how来表示，故本题的空格处填How is。
【小题3】本句的含义也可以为许多人正在房间跳舞，故本题空格处填are dancing。
【小题4】对身份提问的用疑问词who，后跟句子不变的顺序，故本题空格处填Who is。
【小题5】用now来改写，也就是将本句改写为现在进行时，结构为be+doing，故本题空格处填are having。