完形填空。
In China, Tree Planting Day is on 12th March. This special day is set up in 1979. On that day, people can ____ many trees. We should plant ____ trees, and we must also take care of the trees by watering them until they grow up to be strong. In ____ countries, Tree Planting Days are on different days. In India, Tree Planting Day is in July.
People who want to protect the environment plant many trees. But there are some people who want to earn money by cutting down trees. So ____ and more trees are cut down by them. Some people want to ____ the environment and make the air clean, so they plant trees as many as they can.
| 1． | | A．planted | B．plant | C．planting |
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| 5． | | A．protect | B．protecting | C．protects |
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