题目内容：

I used to work in an office, which had a Locust tree growing outside the window．It had grown into a tall tree and must have been there for a long time．_1._.  Unfortunately, this happened to be the room assigned to me, and I was depressed by it for quite some time．

When the first spring came, everything was green except the locust tree．_2.__. One morning, when I opened the window for some fresh air, I unexpectedly smelt a familiar sweet scent(香味) floating into my office which I could not name．_3.__. The tree that I thought dead was in full bloom!

From then on, I usually came to the office very early to see dew(露水) forming on the locust tree blossoms, and was eager to see spring again every year．

During summer, the green leaves provided shade protecting me from the strong sunlight, but allowed enough light in to make it pleasant．_4._. Their beauty touched my soul. Many times, I wanted to take photos but never did．Then, I had to leave in a hurry．Later in life, it became a great regret that I had not done so．

Actually, many times in our lives we think we own something and thus do not value it. __5._. Moreover, sometimes, we have to accept the things we don't want and need to discover the hidden beauty to find unexpected joy!

A. Do value what you own!

B. Suddenly, I realized it was the locust tree!

C. We don't feel regretful until we lose it one day!

D. In autumn, the leaves turned many different colors．

E. I felt very happy because I thought it had died!

F. The tree blocked the view and made the office seem dull.

G. The tree provides much shade and cools the room in summer.