Robert wanted to 1 . 2 he was ready, he got on his bike and left for the cinema. Suddenly, he 3 sirens (警笛). The sound was getting 4 . He looked 5 him to see what was happening. As a result (结果), he 6 off his bike and lay on the road. Luckily, he wasn’t hurt, 7 a car bit his bike. After the car 8 , two men got out and started running. 9 , a police car stopped and three policemen got out and started running after the men, shouting, "Stop the thieves (贼)!" A policeman came to see Robert. He thanked him because he had helped them 10 .

A. before
B. behind
C. in front of