  A model for strong, electroweak and gravitational interactions based on the
local symmetry group $G=SU(3)\times SU(2)_{L}\times U(1)\times C$ where $C$ is
the local conformal symmetry group is proposed. The natural minimal
$G$-invariant form of total lagrangian is postulated. It contains all Standard
Model fields and the gravitational interaction, however the Higgs mass term
$\mu^2\Phi^{\dagger}\Phi$ is forbidden. Using the unitary gauge and the
conformal scale fixing conditions we can eliminate all four real components of
the Higgs field in this model. In spite of that the tree level masses of vector
mesons, leptons and quarks are automatically generated and are given by the
same formulas as in the conventional Standard Model. In this manner one gets
the mass generation without the mechanism of spontaneous symmetry breaking. We
calculated in this model the predictions for a series of electroweak
observables such as $m_{W_{\pm}}/m_Z$, $sin^2\theta_W^{eff}$, Z-boson widths,
$A^l_{FB}$, etc, and we show that they are in agreement with experimental data.
The gravitational sector of the model is also analyzed and it is shown that the
model admits in the classical limit the Einsteinian form of gravitational
interactions.
