根据字母完成下面句子。
（1）My sisyer is three years old but she can c______to ten.
（2）There is an a_____on the grass.
（3）We should do more e_____to keep healthy.
（4）—What should I d_____?
—You should take a  d_____breath.
（5）He is a good s___and he can sing well.