________ is very important in doing anyscientific work.

填入下面文段空白处的词语，最恰当的一组是每年十一月下旬， ①三滴寒雨两阵狂风，树们②齐刷刷地萧瑟了，满眼只剩下一根根秃扫帚似的光杈杈，倒插在白茫茫的大地上。③一个例外，就是柿树。④它们曾经肥厚碧绿的大叶子⑤已然飘落，但光秃秃的细枝上，却⑥挂着一些歌灯笼一样的红柿子。

The students asked Mr. Wang ______ them some advice on reading.

Why does Jane always ask you for help?—- There is no one else ________, is there?

My mother bought an MP4 player for me，but I don’t know．—Let’s read the instructions first．