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We can all do a number of simple things that 1) will/should make a big difference to the environment and we 2) don't have to/musn't change our lifestyles very much either. For example, if you insulate your home, you help the environment and save on your energy bills. Also, you 3)should/need check the settings on your central heating and your fridge. If you 4) turn/ are going to turn the temperature down just a few degrees, you 5) will/must save money and energy 6) before/when you know it. You 7) should/ought also switch all the light bulbs in your house to energy-effcient ones and by this time next year you'II 8) be paying/have paid a lot less.
We can all do a number of simple things that 1) will/should make a big difference to the environment and we 2) don't have to/musn't change our lifestyles very much either. For example, if you insulate your home, you help the environment and save on your energy bills. Also, you 3)should/need check the settings on your central heating and your fridge. If you 4) turn/ are going to turn the temperature down just a few degrees, you 5) will/must save money and energy 6) before/when you know it. You 7) should/ought also switch all the light bulbs in your house to energy-effcient ones and by this time next year you'II 8) be paying/have paid a lot less.
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2mustn't
3need
4are going to
5will
6before
7should
8have paid
:)