读右图漫画“鲸吞农田”，下列措施完全不能解决漫画反映的问题的是

①控制人口增长  ②跨流域调水  ③保护耕地  ④垃圾分类处理

如图所示，玩具“不倒翁”被扳倒后会自动立起来，其奥妙是

下列各句中均有一处错误，请指出并改正
(1)He asked these students volunteer in the after-school study program. ____ 
(2) My uncle wants to help the poor people in the city by set up a food bank. ____ 
(3) Some of my classmates volunteer to sing for the old people to cheer up them. ____ 
(4) What do you think could I do for you?____ 
(5)Be a volunteer is great. ____ 

看一看，算一算，填一填：（每格100米）

邮递员叔叔向____走____米到政府办公楼，再向____走____米就到了学校。
邮递员叔叔从学校出发向____经过医院，再向____走____米就到了李大爷家。
邮递员叔叔到李大爷家一共要走____米。