非金属在一定条件下可以转化为相应的化合物，如：

S+O₂     ____；    C+O₂     ____

有关合金的性质叙述不正确的是                                                            (　　)

请根据文章大意选择适当的单词并用其适当形式填入文章中,使文章意思完整。(有两项多余选项)

money  recycle  divide  help  for  electricity  brush  hard  nobody  as  take  instead

        How did we help to save our earth this week? Let me tell you. First, my family tried to save____ . We never left the lights on when leaving the rooms. We turned off the TV when ____ was watching it. Mum only used cold water in the washing machine. Second, we started ____ this week. We tried to write on both sides of our paper, not just on one side. We also ____ our rubbish into different bags. Mum kept the plastic shopping bags from the supermarket to use them ____ rubbish bags. Third, my family started to save water. We stopped ____ long baths and had short showers____We washed the toilet with used water. Mum and dad used less water to do the washing. My sister and I didn’t leave the tap running when we____ our teeth. At last, mum and dad began to save gas. Mum used to drive us to school, but now my sister and I started riding our bikes to school. It is____ work but good exercise. This week dad and a few of the people in his company also started to go to work in one car and share the costs.
These are great ways ____ protect our environment.