Question

after completing an experiment, all chemical wastes should be *
left at your lab station for the next class.
disposed of according to your instructors directions.
dumped in the sink.
taken home.

if a lab experiment is not completed, you should *
discuss the issue with your instructor
sneak in after school and work alone
come in during lunch and finish while eating lunch
make up some results

Explanation:

• For the first question: Chemical wastes can be hazardous. Leaving them at the lab station for the next class can pose risks. Dumping them in the sink can contaminate water systems. Taking them home is extremely dangerous as they may react improperly outside a controlled lab environment. Disposing of them according to the instructor's directions ensures proper handling based on the nature of the chemicals.
• For the second question: Sneaking in after school and working alone is unsafe as there may be no supervision. Coming in during lunch and working while eating lunch is also unsafe (chemicals could contaminate food). Making up results is unethical. Discussing the issue with the instructor is the proper course of action as they can provide guidance on how to proceed, such as scheduling a time to complete the experiment safely and properly.

Answer:

First question: "disposed of according to your instructor's directions."
Second question: "discuss the issue with your instructor"