Rent(出租)a room
      Spare room? Not only will a lodger (房客) earn you some money, but also, thanks to the government-backed “rent a room” program, you won't have to pay any tax (税) on the first ￡4,500 you make per year. Try advertising your room on Roomspare or Roommateeasy.
Make money during special events
       Don't want a full-time lodger? Then rent on a short-term basis (基础). If you live in the capital, renting a room out during the Olympics or other big events could bring in money. Grashpadder can advertise your space.
Use your roof (屋顶)
      You need the right kind of roof, but some energy companies pay the cost of fixing solar equipment (around￡14,000), and let you use the energy produced for nothing. In return, they get paid for unused energy fed back into the National Grid. However, you have to sign a 25-year agreement with the supplier (供应商), which could prevent you from changing the roof. 

根据语境,仿照画线句，将下面的句子补充完整。

       坚忍是达到成功的阶梯，春蚕忍受着茧的束缚，把纷飞的梦想留给明天；蜡烛忍受着烧身的折磨，把闪烁的光芒留给明天；____，____；____，____。

 硫化氢气体与X反应的化学方程式为2H₂S+X=3S↓+2H₂O，其中X是（　　）