小题1:The DiaoYu islands have belonged to China since ancient times.
小题2:It’s quite necessary to take more actions to prevent the earth from pollution /being polluted.
小题3:They didn’t change their unhealthy lifestyle until they got sick/ill.
小题4:There are three parts of moonlight in the world, and two parts of them are in Yangzhou./ Of all moonlight in the world, two thirds of them are found in Yangzhou./ If the beautiful moonlight can be divided into three parts, two parts will be in Yangzhou./Of all three parts of moonlight in the world, two belong to Yangzhou without doubt.
小题5:I wondered when you arrived/came/got home last night.