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________ a lot of trees in this area, but now we can see a tall building instead.

A. There used to have           B. There used to be

C. There is used to having        D. There is used to being

Have you ever planted a few trees on Tree Planting Day? Each year, millions of people, both 41.______, plant a lot of trees. But this may not be the best way to make your home a 42._____ place.
Last week we visited a park in Hebei. We were 43._____ to find most of the trees had been burned. The workers told us that the trees 44._____ soon after they were planted because they weren’t watered well enough. 45._____ workers burned them and cleaned the place for 46._____ trees to be planted this year. 47.______ a card found in one of the dead trees, a student wrote,” I hope this tree will grow up with me to 48.______ the backbone (棟梁) of our country.” The workers said that the survival (存活) of the trees was really more important than 49.______ trees were planted.
Some people in Beijing now have a new idea that they can donate (捐贈) some money and let professional (專業人士) plant and 50.______ the trees.

A lot of trees and flowers are on ______ of the river and the number of them is growing ______.