Experts still do not know much about this woman and her famous smile.

VOA: special.2010.06.23

"People do not know much about China, especially the latest development.

VOA: special.2010.02.04

Let us say I want to sell my car but I do not know exactly how much it is worth.

VOA: special.2009.04.12

"As much as I like Barack Obama, I just do not know that he has done enough to warrant such an honor."

VOA: standard.2009.10.09