—Which one can I take? —-You can take__________ of them; I'll keep none.

          worries me the way he keeps changing his mind. 

(2013·陕西咸阳二模)Listening to music can be very enjoyable, but ________ can be appreciated unless you like it.

I am afraid there’s __________with the computer. Can you come and have a look?

We feel         our duty to make our country a better place.