用所给动词的适当形式填空。
Many years ago，people 1 (think)the sun went round the earth，and the earth went around the moon．In some countries people even said the sun was a god(上帝)．They thought that he 2 (drive)across the sky everyday on a golden(金色的)horse．Now we know the earth 3 (go)round the sun．Scientists tell us that the earth travels over a thousand miles a minute on its way round the sun．
Some people 4 (be) to the moon since last century(世纪)．Our country 5 (send) the first moon explorer，Chang’e I (月球探测仪——嫦娥一号)into the space on Oct 24th，2007．And it 6 (take)the first photo of the moon．All of our Chinese are proud of it．From now on，we must 7 (work)hard to make a contribution to developing the newest moon explorer，we are looking forward to 8 (see)it land on the moon with people some day．
Of course the sun is too hot for people 9 (reach)now．Maybe in the future people 10 (land)on the sun．