When I was in primary school, I was told that the earth ______around the sun.

—What _______ the number of the students in your school?—About two thousand. A number of them _______ from the countryside.

____of the money  _____used up.

______ they grow they make sure that what is left in the ground after harvesting______ a natural fertilizer for the next year’s crop.

The country’s population ______ small, and most of its population ______ in the mountainous areas．