①∅=0；②∅={0}；③∅={∅}；④0∈∅；⑤0∈{0}；⑥∅∈{∅}；⑦∅⊊{∅}．
如图是a、b、c三种固体物质的溶解度曲线，请回答下列问题：
_____ a medicine box under her arm, Miss Zhao hurried to look after the man.
