What did Daming_________ for his Mum?
A:bought
B:buys
C:buy
——Look! What's on the ground? —— Oh, it's my sweater. Please .
Mary got an ______ from Lisa the day before yesterday. Lisa ______ her to go to her birthday party.
请画出图中的折射光线.
排列错乱的句子,在括号里写上序号。
____借着楼道的灯光,我将教室的门锁好,走下楼去。
____我关上楼道的灯,摸黑下了楼。
____写完作业,灯火通明的教室里就剩下我一个人了。
____一夜要浪费多少电啊!于是,我转身又上了楼。
____我快速收好书包,熄灭灯,走出教室。
____走到操场,我忽然想起楼道的灯没关。