问题补充：
His name was on the of my tongue, but I just couldn recall it.
A. end
B. point
C. edge
D. tip
答案：
A. end
B. point
C. edge
(答案→)D. tip
解析：be on (or at) the tip of ones tongue 就在嘴边，差点被想起，如：The answer was
on the tip of my tongue, but I could think of it.(我差点就想起那答案来，可就是想不起来。) be on the point of 正要（去做某事）：I was just on the point of going when you came in.
