The subjunctive mood is the best.
The subjunctive is rarely used in colloquial English. Totally irrelevant information, but... it is a relic from Latin, where there are many uses for a subjunctive. There is even a special conditional using the subjunctive mood that expresses the exact circumstances you described, which is usually called future less vivid.
The sentence presented above is an example of a complex sentence based on its structure. A complex sentence contains an independent clause and a dependent one. In the given the independent clause is the man was already listening to his new iPod and the dependent clause is ready to go out for his daily jog around Central Park.
Answer:
Alyssa is so Impassive that her friends never know how she is feeling. *