1．从今以后，我们要更加努力学习英语。(from now on)

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2．你应该学会如何与他人相处。(get on with…)

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3．植树可以防止土壤沙化。(stop…from…)

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4．假如每个人都为保护环境做出自己的贡献，这个世界将变得更加美丽。(make a contribution to…)

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5．轮到你在会上发言了。(turn)

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1、1. We must study English harder from now / today / this time on.

2. You should learn how to get along/on with others.

3. Planting trees can stop/prevent soil/keep soil from changing into sand.

4. The world will become much more beautiful if everyone makes a contribution to protecting the environment.

5. It's your turn to speak in the meeting.