Fill in the blanks with the correct prepositions
There are four main reasons why some changes will come ...
We will become more worried …. security.
The central computer will send … instructions to start cooking.
To look … itself, an intelligent house will require electronic sensors.
The house will work … when it is time to water the garden.
Future houses will not rely … their occupants
They keep an eye … for burglars.
Fill in the blanks with correct prepositions.
If anyone tries to break …. , it will alert the police.
The house will see to it that the fire is put … straightaway.
The conventional fuels become more expensive as their supply starts to run….

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