完形填空。 It's March now. It's time 1_______
题型：完形填空
问题：
| 完形填空。 | ||||
| It's March now. It's time 1____________ plant trees (植树). Today is the 2nd of March. The students of 2____________ are planting trees. Some are 3____________. Some are carrying water. 4____________ are watering the trees. All of the students are busy. 5____________ hard all the students are working! They are helping to make our country beautiful.
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