I'm an employee and my company is using Gmail (for business) for all communications.
Are they able to see and review all the email messages I send?
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Yes, as well as deleted emails. The component of Google Apps for Work (now known as GSuite) designed to explore employee emails and chats is called Vault.
Manage, retain, search and export your organization’s email and on-the-record chats.
Further, the key selling point is search in the org:
Google-powered search to find content quickly. Find and retrieve valuable information, even from closed accounts. It’s a smart way to gather what your legal team needs and prevent data loss from employee turnover.
The only thing you can do is delete it "forever" from within the Trash folder and hope for the best. We had Gmail for business for a short time before switching to Exchange, and I am pretty sure that all of the emails are available to the admins, even those in the trash folder. For the most part I have to assume that your Admins are not searching through the trash folders unless there is a good reason too, personally I couldn't be bothered.