Choose the correct answer

You ______not run in the corridors. It`s dangerous.
1. can
2. must
________ I ask you a question?
1. can
2. should
_________ we go out for lunch today?
1. will
2. shall
You _____ stay at home if you are ill.
1. must
2. shouldn`t
Tommy ________ tell the time when he was a baby.
1. can`t
2. couldn`t
My book ______ be in the house. I`ve looked everywhere.
1. can`t
2. mustn`t
You _______ clean the windows. I`ve already done it.
1. might
2. needn`t
________ I help you?
1. will
2. shall
You ___________ do the shopping. I`ll do it later.
1. needn`t
2. mustn`t
Sam left late for the airport this morning. He ______ have missed his flight.
1. should
2. could