P-11：pop up(show up unexpectedly) 突然出现
A:One of my old friends popped up in front of me yesterday. You can't imagine how surprised I was at that time!
A:昨天我的一个老朋友突然出现在我的面前，你想象不到我有多吃惊。
B:He must have had your address.
B：他一定知道你的地址。
A:But we haven't kept in louch with each other since we left school.
A：但我们自从离开学校后根本没有联系过。
B:He could get it from your other friends.
B：他可能从你其他的朋友那里得到了你的地址
