(1)$ \int \dfrac {dx}{x \ln ^{2}x}= \underline { \quad \quad \quad }$.
(2) $\int \dfrac {( \ln \ln x)^{2}dx}{x \ln x}= \underline { \quad \quad \quad }$.
(3) $\int \dfrac {1+ \ln x}{(x \ln x)^{2}}dx= \underline { \quad \quad \quad }$.
$\text{A.}$
$\text{B.}$
$\text{C.}$
$\text{D.}$