1) Simon wants to do his ... for his country. That's why he joined the army. 2) Switch ... the light before you leave the house. We don't want to waste electricity. 3) I think I could ... without chocolate. I'm not a big fan of sweets. 4) Without our help a lot of endangered species may die … . 5) Make ... you're home by midnight. Otherwise you'll be in trouble. 6) What do we call it when there's not enough water temporarily? 7) Guerilla gardening is catching … in a lot of countries. 8) What do we call a long period of time without any rain? 9) We're all out of coffee. I'll have to make do ... tea. 10) ... should be very careful when their walking along a busy street. 11) Recycling plastic bottles ... sense. 12) I want to save the planet; not for me but for future ... . 13) Solar power is a source of alternative ... . 14) Who is a consumer? 15) I'm freezing! I ... do with a warm sweater and a air of gloves. 16) All the money, that will be collected, will go … buying new computers for the IT room. 17) I’ve picked … a bit of German during my holiday in Germany. 18) I hope you’ll report … any important discoveries that you make.

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