Is there a baby in the room（变复数词

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• 把句子变成被动语态1.They laughed at home.2 They will build the bridge.3He took good care of the baby.4Can you finish it in two hours.5The students often do such exersices in class 6They are making machines .7 The task has been finished by us（变主动语态） 8They allowed--------（enter）the room 9.The teachers allowed us to ---------(go)in.(变被动语态,还要填空）
• there is a woman near the house,变复数 there are some buses near the hill.变单数 is there a baby inthere is a woman near the house,变复数 there are some buses near the hill.变单数is there a baby in the room?变复数
• Is there a baby in the room（变复数词
• Is there a baby in the room（变复数词
• 把铁、氧化铁、氧化铜的混合物粉末放入110mL 4mol•L-1盐酸中，充分反应后产生896mL H2（标准状况），残留固体1.28g.过滤，滤液中无Cu2+.将滤液加水稀释到200mL，测得其中c（H+）为0.4mol•L-1.则原混合物的总质量为（　　）A. 14.4 gB. 16 gC. l2.8 gD. 13.6 g
• there is a genuinely mean woman in this room这句话是什么意思?