Choose the correct item 1) you( shouldn't/couldn't) tell anyone your real name online. 2) you (don't have to/shouldn't

1) You shouldn\'t tell anyone your real name online. 2) You don\'t have to be an expert to scuba dive. 3) Suzy had to take lessons before she went diving. 4) You should check the weather before you go. 5) You mustn\'t swim alone. 6) Some jellyfish stings can kill you. 7) Tim was able to win the race in the end. 8) You must look out for warning signs. 9) Dan could play the piano when he was six.