﹣﹣﹣Would you mind my using your pen？
﹣﹣﹣Of course not._______ .（ ）
A．It doesn't matterB．I'd love to
C．Go aheadD．That's all right
______ he heard the little girl crying for help outside，he rushed out of the room.（ ）
A．As soon asB．UnlessC．IfD．Although
The earth is in great danger now.We have to do something _______ it.（ ）
A．protectB．protectingC．to protectD．protected
﹣﹣﹣I am going to sell all your old books.They are taking up a lot of space.
﹣﹣﹣______ !They're everything to me.If you sell them，you will take my life.（ ）
A．I couldn't agree more
B．You can't be serious
C．It's nothing
D．Sounds good
﹣﹣﹣You _______ take photos here!Look at the sign.It says"No photos".
﹣﹣﹣ Sorry，I won't.（ ）
A．mustB．needC．mustn'tD．needn't