Read the sentences and decide which one of the given words fits each gap in the expressions:
 
1. You need to log ______ before you can start using it.
 
 
2. I need to key this data ______ the database.
 
 
3. We'll have to wait whilst the computer powers ______ . Then we can start.
 
 
4. It's not enough to just delete the information. It is still there and can be recovered. You need to wipe it ______ with a special program.
 
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