Hi, guys. Can I check with you these sentences? Do they sound natural enough to say?
1. Almost half of the company's staff have been let go since the beginning of the recession.
2. In the 90s, this program was distributed as a collection of files on CD-ROM. Nowadays, it can be easily downloaded online.
3. Sometimes, as anyone who's ever solved a computer problem before knows, it's usually the simplest problems that are overlooked.
4. You must curb access to your personal computer as much as possible if you want your data to be secure.