720-20=____ 4×9=____
340-300=____ 38÷7=____……____
580+210=____ 423+300=____
50÷7=____……____ 518-500=____
8×9=____ 732+200=____
张骞出使西域后,丝绸之路渐趋形成。该商路的起点是( )
Well ____ (保养维护), the second- hand car is still in good condition.