About 80 percent of the students in our school_____ been working on the program and about two-thirds of the work _____been finished.
After visiting Harbin, most of the foreign friends said they would never forget the time ________ they had spent.
My favorite writer is Mo Yan, some of ________ novels have a surprising ending.
A lot of lovers chose to get married on Dec. 12, 2012, ________ the date, the month and the year match.
I felt surprised that anyone of his intelligence ________ such an easy test.
We ________ take clean drinking water for granted. One day we may run out of it.