晚上太阳下山时，小明面对太阳，请问小明的身后是____。
计算下面各题，得数保留两位小数．
6.8÷0.26=____
3.55×0.17=____
—Do you know that China is one of ________countries in the world? —Yes, I do. It's much ______than the US.
