Условие задания:

4 Б.
Read the sentences and decide which one of the given words fits each gap in the expressions:
 
1. There was a fire and they had to shut ______ the main computer.
 
 
2. You need to back ______ your important files.
 
 
3. I'll print ______ the relevant information.
 
 
4. They were able to hack ______ Microsoft's system and steal the passwords.
 
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