people in the west celebrate halloween y having a party(by having a party)对划线部分提问

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• All the children are having an English party now改为一般疑问句Jack is writing an email to his paren in the library对划线部分进行提问（划线部分是in the library）Is your father having a haircut now?做肯定回答Tony is looking for(寻找)his magazine in the dining room.对划线部分进行提问（划线部分是his magazine ）We are drinking in the pub.(改为否定句)
• All the people are having a great time改为同义句______is having_____还有 Sam is having a party at his house（就划线部分提问）划线部分是having a party_____Sam______at his house?
• people in the west celebrate halloween y having a party(by having a party)对划线部分提问
• people in the west celebrate halloween y having a party(by having a party)对划线部分提问
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• 如图，△ABC的三条角平分线交于点O，过点O作OE⊥BC于点E，求证：∠BOD=∠COE．