Multi-select problem: How does the next paragraph end?

How to be safe when using a chemistry lab
Be smart about chemicals and the dangers they pose.
Some chemicals are harmless; others can kill you! Until you are familiar with the chemicals you are using in the lab, always ask an instructor for help. There are a few basic points about chemical safety to bear in mind :
Never mess with an unlabeled chemical.

Available options: [+] Getting toxic shock or heart attack could result in death. Begin using the theoretical spaces of the lab. [+] Find an academic chemistry lab that is clean. It should be clean and free of chemicals and other toxic items. [+] Always sweep it under the microscope using a lint-free material. Always note those parties that are coming into the lab. [+] It may be corrosive and dangerous to your skin, and mixing it with other chemicals could produce toxic fumes or even an explosion. Know the difference between an acid and a base.
It may be corrosive and dangerous to your skin, and mixing it with other chemicals could produce toxic fumes or even an explosion. Know the difference between an acid and a base.