Select proper alternative and complete the following paragraph.
(NASA, ISRO, Apollo-2, Stones , manned Luna 2 , ummanned , Chandrayaan-1 , USA, Soviet Union , India)
The spacerafts in the Luna series sent by ……….. reached near the moon. `............`, launched in 1959 was first craft in this series . Till 1975, 15 spacecrafts were sent to moon, which made chemical analysis of the moon and also measured its gravity , density and radiations. Last four crafts even landed on the moon and brought the samples of `.................` from the surface of the moon for analysis in the laboratories . America also executed moon missions in the duration of 1962 to 1972 . The speciality of these missions was that some of these were `..........` missions . In July ,1969 , Neil Armstrong become the first human to step on the moon. In 2008 , `...........` launched `............` and placed it into an orbit around the moon . It obtained useful information of moon for about a year.

Explanation

To complete the given paragraph, we will fill in the blanks with the appropriate alternatives based on the information provided.

### Step-by-Step Solution:

1. **Identify the organization that sent the Luna series spacecraft:**
- The Luna series was sent by the **Soviet Union**.
- **Fill in Blank 1:** Soviet Union

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