He may come,but I'm not sure ______ that.
—Why was he late for school? — ________his bike was broken on the road.
This piano is too big. Can you make ________ for it?
There was _______terrible earthquake in 2011 in Japan! It killed _______ people.
There __________ some children in the painting room. They are studying painting.
The geography teacher told us the earth________ bigger than the moon.