依次填入下面一段文字横线处的句子，衔接最恰当的一组是一棵树就是一条竖立着的河流， ， ，树皮交错的纹路形如流水，从根部到梢头，就像从源头到下游，只是有些平静些， ；有些粗粝些， 。①重现风雨波澜②枝枝杈杈是分支流③树干是主河道④像水一样光滑

Some children can’t afford ________ necessary stationary.- Let’s donate our pocket money to them.

In developed countries, farm workers_________ only a small section of the population.

If you know the pronunciation of the letter “a” in the word “cake”, do you know how to read “haze”

Indonesia_____ some 3,000 islands stretching more than 2,000 miles from east to west.