Writing this book has been a great pleasure________________(心甘情愿做的事) .

A．The woman has trouble getting along with the professor.
B．The woman regrets having taken up much of the professor’’s time.
C．The woman knew the professor was busy.
D．The woman knew the professor had run into trouble.

A．They would live a better life in the sky.
B．They were frightened by people on the earth.
C．People hoped they would not be able to do any more damage since they were far away from them.
D．People respected them too much.