Soon I heard a ＿＿like that of a door burst inand then a climb of feet.

We discussed the high rate of single parent family, and wondered how to explain this ______.  

AIDS is spreading all over the world at shocking speed. Where its dark _______ appears, we see pain, tears and death.

He can speak English, German, French and Japanese. He is nearly a man with a (an) ______ for language.

I like the sofa we’ve found in the shop. In my opinion, it is a perfect ________ for the furniture (家具) in our sitting room.