Fill in the blanks with the words from the box. You may need to change the forms of some words. $\begin{array}{|l|l|l|l|l|l|l|l|l|l|} \hline \textbf{up} & \textbf{an} & \textbf{and} & \textbf{useful} & \textbf{from} & \textbf{a} & \textbf{in} & \textbf{to} & \textbf{life} & \textbf{great} \\ \hline \end{array}$ There is a close relationship between man (a) — nature. Man has established (b) — friendship with nature. It helps us (c) — many ways. Similarly, trees are closely related (d) — our life. Nature plays (e) — important role in our (f) — and economy. Trees are very (g) — to us. We get oxygen (h) — them. They are a (i) — source of food and vitamin. They meet (j) — our local demands.