初三同义句转换The policeman spent half an hour explaining the safet

After half an hour,the next bus came.(同义句转换) Half an hour （ I spent half an hour arriving at the top of the mountain.同义句 I spent half an hour getting to the shop改为同义句 英语I spent half an hour getting to the shop.改为同义句：( )( )( )ha I spent half an hour writing the letter 改为同义句 I spent half an hour geting to the shop.的同义句 He spent half an hour on the newspaper yesterday (改为同义句) I spent half an hour cleaning my room.（同义句转换） My father exercises half an hour a day in the morning.(同义句转换 I heard the rain half an hour.(同义句） l heard the rain half an hour later 同义句 初三英语竞赛题The film began half an hour ago.(同意句转换）The film （ ）ha