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1. What were the names of Yishmael's wives?
2. Why was Avrohom sitting by the entrance of his tent?
3. What did Hashem remember regarding Avrohom (Bereshis 19:29)?
4. When did Soroh become pregnant with Yitzchok?
5. Who accompanied Avrohom and Yitzchok on the way to the Akeidah?

Answers
1.Yishmael married and divorced Adisha and then married Patina (Targum Yonoson 21:21)
2. Avrohom was sitting at the entrance of his tent to see if anyone was travelling by that he could invite inside (Rashi 18:2).
3. Hashem remembered that although Lot knew that Soroh was Avrohom's wife, he did not reveal this to Paroh in Egypt. Hashem took mercy on Lot because of Lot's concern for Avrohom's well-being (Rashi 19:29).
4. If Yitzchok was born at Pesach time, Soroh became pregnant with Yitzchok in Tammuz. The Gezeira that she would have a baby occured on the prior Rosh Hashana. (Gemara Rosh Hashana 11a. See Maharsha there. Also see Tosfos Bava Kamma 92a).
5. Yishmael and Eliezer accompanied Avrohom as he brought Yitzchok to the Akeidah (Rashi 22:3).