`timescale 1ns/1ns module mux4_1( input [1:0]d1,d2,d3,d0, input [1:0]sel, output[1:0]mux_out ); //**code// reg [1:0] temp; always@(*) begin case(sel) 2'b00: temp =d3; 2'b01: temp =d2; 2'b10: temp =d1; 2'b11: temp =d0; default :temp=0; endcase end assig...