根据短文内容及母提示完成所缺的单词。
Adults smile less than children do in a day. 386 times less, in fact. As a result, we are becoming more
and more unhappy and u __1__.
All human beings are b __2__ to know how to smile. Children are s __3__ to smile up to 400 times a
day. For them, a smile comes from their h __4__ and pleasure. Unluckily, as we grow o __5__ , we
smile less and less.
"Adults only smile 14 times a day," says Jamb, a researcher. That means they only smile e __6__ two
hours.
"Life has so many problems that we have forgotten all the r __7__ to smile,"she says.
We just need to look for things that m __8__ us smile, for example, by smiling at a child in a
supermarket.
"Why are you afraid of a smile?" Jamb asks. Trying best to smile is the s __9__ of your happy journey!
And anyway, s __10__ is a nice thing to do.
