The little mouse is under the table,so it is not easy to find it. 那只小老鼠在桌子底下,因此不容易找到它。 The Great Wall winds its way from west to east,across deserts,over moun-tains,through valleys,till at last it reaches the sea. 长城从西向东穿过沙漠,跨过高山,穿过深谷,蜿蜒而行,直到最后到达大海。 题组训练·用介词完成句子 ①The sunlight came in　through    (穿过)the windows in the roof and lit up the whole room. ②Who is the boy 　beside    (在……旁边)you?