Điền từ thích hợp

A long time ago, robots belonged to science fiction. But today, robots(21)_______ real, and they are helping us. In the future, we will all have robots. they(22)_______ clean the floor, wash the dishes, cook meals, take care (23) children, make drinks and do many other housework. I even think one day we'll have robots friends. In Japan today, robot engineers are making robots to (24)_______ old people. It's still early days. I'd say we are another 20 to 30 years alway robots being everywhere in our lives. What will happen to us( 25) _______the world is full of robots? Maybe one day we won'tbe able to tell robots and humans apart.