一：how much are the socks?they are( )the price( )50 yuan.A for,of B on,in C in,at D at,of
二：Jack,s(杰克的) book is nemer than sam,s（汤姆的）(改为同义句)
Sam,s（汤姆的）book is （ ）（ ）Jack,s（杰克的）