Question: Must a person force himself to learn with a chavrusa even though he learns better by himself?

Short Answer: If a person learns better by himself, he may learn alone, but he should try to have at least one chavrusa each day.

Question: May you fulfill your mitzvah of daled minim with a dry lulav?

Short Answer: A dry lulav is pasul, even b’dieved. There is a dispute as to why a dry lulav is pasul. Nevertheless, we allow a dry lulav bish’as ha’d’chak.