The boy is so naughty that he never his mother

(2013·亳州模拟)　　　difficult and challenging the task may be, we must finish it on time, because there is a possibility　　　we’ll be fired if we can’t fulfill the task on time

a sudden, the thief walking behind ayoung and pretty lady _______ her purse, ______into the crowd.

She has a gift for creating an atmosphere for her students ____ allows them to communicate freely with each other.

You ______ be driven out of the school if you dare to cheat in the exam.