His behavior is understandable.

A. Tina couldn't steal the money.

B. Tina couldn't have stolen the money.

C. Tina mustn't have stolen the money.

D. Tina shouldn't have stolen the money.

A. John is worthless to help.

B. John is worth helping.

C. It is no use to ask John for help.

D. It is no good asking John to help.

A. I wish you wouldn't talk with your mouth full of food.

B. I prefer you to talk when your mouth is not full of food.

C. I would like you to talk when your mouth is not full of food.

D. I would rather you didn't talk with your mouth full of food.

A. Kate who understands the problem you have mentioned is a teacher.

B. Because Kate is a teacher, she can understand the problem you have mentioned

C. Because of a teacher, Kate can understand the problem you have mentioned.

D. Kate, who a teacher, can understand the problem you have mentioned.

A. A person cannot work as fast as a computer.

B. A computer can work less slowly than a person.

C. A person cannot work faster than a computer.

D. A person can work less faster than a computer.

A. There is no reason to complain about him.

B. There is no reason why he complains.

C. Why he complains is no reason.

D. It is of no cause to complain.