Найдите ошибки в предложениях:What is he talking?It is often raining in autumnMy friend which lives in St Petersburg

1) What is he talking about? 2) It often rains in autumn. 3) My friend who lives in St. Petersburg is a student. 4) My mother works at home, so she doesn\'t have to go to her office every day. 5) Children are not allowed to swim here without an adult. 6) What a rainy day! Let\'s stay indoors. 7) The bridge was built last year. 8) Russian is spoken by millions of people. 9) More than 100 million people speak Japanese. 10) You must not ride a bike here. It is dangerous.