1.做这个实验时,你首先要往这种物质里加水.(add)
问题描述：
1.做这个实验时,你首先要往这种物质里加水.(add)
2.金属遇热则膨胀.(expand)
3.我们都为我们这次实验的成功而感到骄傲.(be pround of)
答
1.when doing such experiment,first of all,you should add water into this substance.2.metals often expand if heated.3.all of us are proud of the success of this experiment.