| 1 | Heat is used to evaporate milk. | |
| 2 | This money will go towards the debt. | |
| 3 | The vaccine was used to protect the whole population against infection. | |
| 4 | Litmus paper can be used as an indicator of the presence of acid in a solution. | |
| 5 | We must study dialectical materialism so that we can use it to guide our work. |
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