—Do you have _____ trouble finishing the work?—The work is not so difficult as you think. We have finished it already.
If better use is ________ of your spare time, you'll make good progress in doing your business.
The couple ________ a health centre in Cambodia,________ their seven year old son was born.
There used to be a mountain in our village, at the top of which ________.
It was along the Mississippi River ________ Mark Twain spent much of his childhood.
Linda,make sure the tables ________ before the guests arrive.