17、 __________ ，you must show your ticket to go into the cinema.

　　A.No matter whoever you are

　　B.Whom you are

　　C.Whoever you are

　　D.No matter who are you

　　18、 He was__________ of deciding anything for himself.

　　A.incapable

　　B.packed

　　C.incompetent

　　D.unable

　　19、 Don’t be too __________on your children.They are still too young.

　　A.cruel

　　B.severe

　　C.strict

　　D.sharp

　　20、 By the time he arrives in Beijin9，we__________ here for two days.

　　A.have been staying

　　B.have stayed

　　C.shall stay

　　D.will have stayed