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1.These species of animals will return when their habitat (be safe)
2.We'll decide where to go for a weekend after we (hear) the forecast.
3.The wildlife will survive if people (take care) of it.
4. Their journey will be safe if they (go) by train.
5.I'll tell you all about air pollution if you (ask) me

1. These species of animals will return when their habitat is safe. 2. We'll decide where to go for a weekend after we hear the forecast. 3. The wildlife will survive if people take care of it. 4. Their journey will be safe if they go by train. 5. I'll tell you all about air pollution if you ask me