词形变换

小题1:That old printer doesn’t print as__________(quick) as this new one.

小题2:It’s ________ (meaningful) experience I have ever had. I’ll never forget it.

小题3:—How does the robot work properly?   —Oh, it _______ (control) by the computer.

小题4:On the _________(five)day, we went to the cultural centre of Hong Kong.

小题5:There __________ (not be) much pollution in our hometown two years ago.

小题6:The _________ (mouse) in the computer room are useless. Please throw them away.

小题7:Someone knocked at the door while Jim __________(sweep) the floor.

小题8:—What's wrong with your TV set？    —The picture_________ (not come) out yet．

小题9:I don’t think we need to bring everything with _________ (we) when traveling.

小题10:The aim of the charity show is _________(raise) money for Project Hope.

如图是探究空气中氧气含量的实验；回答下列问题：

（1）若燃烧匙中放的是足量红磷，写出红磷燃烧的化学反应方程式；

（2）该实验可以推断出氮气具有的化学性质有哪些？

（3）为了确保该实验成功，对于燃烧物和生成物各有哪些要求．