选择合适的答案

①Did they go home by bike ?  ____            

②Where did you go yesterday ?  ____            

③What did you see ?   ____                    

④ Did you see a bus yesterday ?  ____           

⑤ When did your father come back ?  ____       

⑥ Do you live in London, too ?   ____          

⑦Did John eat rice yesterday ?   ____            

⑧How did you go home yesterday ?____           

⑨When did you come back ?   ____              

⑩What did she do yesterday ?  ____              

A No, I didn’t.   B Yes, he did .   C I went to the park .    D Yes, I do .

E I came back last Friday.   F No , they didn’t.    G We went home by bus .

H I saw lots of places .    I She watched TV.    J He came back last Sunday.

下列各物质属于电解质的是（　　）

①NaOH②BaSO₄③Cu④蔗糖⑤CO₂．