-Look at the picture on the wall. It be David's.-Yes, his name is on the first page.
—Is the schoolbag beautiful? —Yes, at _____ it’s _____ the one you bought for me.
—What do you think of Project Hope? —Great! It has made important contributions _____the education.
The traffic in the city _____ be terrible, but now it has improved a lot. I think you will ____ it soon.
—How long has Kangkang _____from home? —For five days.
—I have never visited the Great Wall. —_____.