Everyone knows that _____ sun is in the center of the solar system（太阳系）

It ＿＿ me three hours to do my homework yesterday.

Yang Xiangming, ________teacher of Taizhou Experimental School, devoted his life to saving_______13-year-old boy who fell into water.

She doesn’t want to do it .We have to find _____to do it.

Is it under the table? —No,it isn’t. It’s _____the table.[ ]