代数式2a+b表示的实际意义：____ 

模仿秀，用划线词造句。

①风筝凌空飞起，渐渐高过树梢了。

②我们垂头丧气发地坐在田埂上。

③我们心中充满了憧憬和希望。

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 ____.