用括号所给单词的适当形式填空4W5O-n;Z:B.J0J9l)t9\2i6I
He is old enough. He can do it by .n*|4p)h-@9N)l'L6I/|8L .（he）4W5O-n;Z:B.J0J9l)t9\2i6I