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1. 
Security "is" improved if procedures are in place. (can)
2. 
Data leakage "is" a result of poor security. (may)
3. 
A possible cause of data leakage is that employees "don't realize" that they should not discuss work with friends and family. (may)
4. 
One reason for this "is" a lack of training. (might)
5. 
Data leakage "is also" caused by employees' use of instant-messaging programs. (might)
6. 
Certain Internet sites "are" infected by viruses, so it is advisable to limit access to them. (may)
7. 
Certain Internet sites are infected by viruses, so it "is" advisable to limit access to them. (would)
8. 
Employees' laptops "infect" company computers, which causes data loss. (might)
9. 
Employees' laptops infect company computers, which "causes" data loss. (may)
10. 
One possible solution "is" to check employees' devices on a regular basis for malware. (could)