基本语法

1. I think Erin should tell her friend Anna not __________ (be) late for class again.

2. __________ we __________ (need) to buy some more chicken, mom?

3. Don't let the students __________ (do) lots of homework.

4. Could you please __________(bring) your photos to school?

5. Can I borrow some books __________ the library this afternoon?

6. We'd like you __________( play) volleyball with us.

7. All my friends __________ (invite) to the party, but he __________ (not invite) me.

8. Can you see some boys __________ (play) basketball over there?

9. I think they need more time __________ (study) so that they can get good grades.

10. The old man seemed __________ (know) nothing about this accident.

纯净的H₂可以在黄绿色的Cl₂中安静燃烧，发出苍白色火焰，生成氯化氢（HCl）气体。实验室用锌与稀硫酸反应来制取氢气，并进行氢气在氯气(Cl₂)中燃烧的实验(装置见下图)。请回答下列问题。

（1）写出图中有标号仪器的名称： a                    ； b                  。

（2）在点燃氢气之前，要先检验                      。

（3）写出锌与稀硫酸反应制取氢气的化学方程式：                               。

（4）写出氢气在氯气中燃烧的化学方程式：                             。该反应的基本类型属于                     。