Read the sentences and decide which one of the given words fits each gap in the expressions:
1. After you finish, you need to log ______ .
2. It takes ages for my computer to boot ______ in the morning. I turn it on and go off for a coffee.
3. Remember to switch this ______ when you are not using it to save power.
4. They were able to hack ______ Microsoft's system and steal the passwords.
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