If Tom......a dog, he ............, sees / run, sees / will run, if we ..... or cycle, we .......healthy., walk / will be, walks / are, If you ......paper, you ...... trees, reuse / will save, reuses / saves, If you .......noise, you sister ............sleep., make/ won't sleep, make / will sleep, If I .......a used bottle on the road, I ........ it in the bin., see / will put, see / won't put, If Nam ...... near his school, he ......walk to school . , live / will walk, lives / will walk , If my friends .........trees in the garden, they ............the school's environment. , plants / will save, plant / will save, If we ......hungry, we ........tired., are / will be, is / will be, If we ..........enough, we ........hungry., don't eat/ will be, doesn't eat / will, If Tom......a dog, he ............, sees / run, sees / will run, If I .......a used bottle on the road, I ........ it in the bin., see / will put, see / won't put, If you .......noise, you sister ............sleep., make/ won't sleep, make / will sleep, if we ..... or cycle, we .......healthy., walk / will be, walks / are, If we ..........enough, we ........hungry., don't eat/ will be, doesn't eat / will.

First Conditional.

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