the best way to learn chinese is ( ) practice more reading and writing.学习汉语最的方法是多读多写,请问括号中填什么音词?

the best way to learn chinese is ( ) practice more reading and writing.学习汉语最的方法是多读多写,请问括号中填什么音词?
the best way to learn chinese is ( ) practice more reading and writing.
学习汉语最的方法是多读多写,请问括号中填什么音词?

the best way to learn chinese is ( ) practice more reading and writing.学习汉语最的方法是多读多写,请问括号中填什么音词?
to,to do sth.作be的表语