Some researchers believe that there is no doubt ________ a cure for AIDS will be found.(2005年广东省高考题)
I have bought two ball pens, _____ writes well.
I bought a dress for only 10 dollars in a sale; it was a real ______. A. exchange B. business C bargain D. reward
--- Did you have ____fun on your trip ? ---- Yes,. It’s really ____ pity that you didn’t come with us.
---Where is my pen? --- I _____it.
The man ______ you are talking is in the next room.