fill in each blank with can,can't,could or couldn't 1.robots now _________ help astronauts perform very difficult tasks. 2. _________ robots recgnise our voices five years ago? 3.i read the book three times,but i _________ understand it. 4.i _________ remember his name.d you know it? 5.ten years ago,my granpa _________ ride a house,but now he can't. 6.our daughter _________read until she wwas seven years old. 7.sorry,i _________help you.you must do my homework. 8.mozart _________play the piano when he was only five years old. 9.we _________buy any bread because the baker's was closed. 10.jeany _________ help you plan vegetables.she knows a lot about gardening