Lily’s mother is too busy _______ housework _________ her with her homework.

It was lucky that little Jack was not at home when the fire broke out；otherwise，hehis life．

This kind of storiesinstructive while stories of that kindharmful to children

下列各句中，没有词类活用现象的一句是(　　)

“— Is this your notebook —Yes, it is.” 朗读这组问答句的正确声调是_______.