Some scientists believe that ________ is no doubt ________ a cure for AIDS will be found.

You haven’t been to the West Lake in Hangzhou, haveyou— _______. How I wish to go there!

Climbing the mountain was so ___ that I was completely ___ out.

Without electricity human life ________ quite different today.

a pity that he missed his final shot and ended in a tie!—Yes, but he didn’t lose it ________！ It just wasn’t his day.