Last week he borrowed a book from the library. Today he has to return it to the library.
A:give……back
B:take……back
C:look back
我每天____上学,____放学
I go to bed at 9:00.
Tina began to practise the piano ____ ____ ____ ____.
根据溶液的组成填写如表
溶液
石灰水
蔗糖水
碘酒
稀硫酸
溶质
____
溶剂