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 ____.