根据句意及汉语或首字母提示完成单词
first of all, from now on, hundreds of,
be careful with, at the moment
⑥This kind old man is not rich but he helps ____ poor children.
⑦ You must study hard ____ and be a good boy.
⑧ ____, let me introduce myself to you.
⑨ ____ that glass. Don't break it.
⑩ The children are playing football on the playground ____.
