Choose a sentence which has the same meaning as the original one.

We shouldn't swim in this lake. Water is highly polluted.

We shouldn't throw the bottles away but they can be collected and recycled.

We shouldn't throw the bottles away because they can't be collected and recycled. 

We shouldn't throw the bottles away because they can collect and recycle. 

We shouldn't throw the bottles away because they can be collected and recycled.

Unless we don’t save water, we will have to suffer from water shortage.

If we save water, we won't have to suffer from water shortage.

Unless we save water, we won't have to suffer from water shortage.

If we save water, we will have to suffer from water shortage.

Unless we limit the world’s population, there won't be enough space to live.

There won't be enough space to live unless we don't try to limit the world’s population.

There will be enough space to live unless we don't try to limit the worlds population.

Unless we limit the world’s population, there will be enough space to live.

If she can speak English well, she would apply for the job.

If she could speak English well, she will apply for the job.

If she could speak English well, she would apply for the job.

If she can speak English well, she will apply for the job.