我的妹妹病了。我需要在家照顾她。 My little sister is ill. I need to ________ ________ ________ her at home. 这个小女孩日夜思念着妈妈。 The girl misses her mother ________ ________ _______. 我们准备给你们加油。 We are going to _________ you _________ . 我们每天至少需要睡8个小时。 We need to sleep _______ _______ 8 hours every day. 你知道他们象征什么吗? Do you know what they ___________ __________? David长大以后想成为一名科学家。 David wants to be a scientist when he __________ _________.