Question

correct the text by inserting one comma. after nasa successfully landed astronauts on the moon in 1969 the agency made several more missions to the moon in the 1970s.

Explanation:

The sentence has a dependent clause ("After NASA successfully landed astronauts on the moon in 1969") followed by an independent clause ("the agency made several more missions to the moon in the 1970s"). A comma is needed to separate the dependent clause from the independent clause. So we insert a comma after "1969".

Answer:

After NASA successfully landed astronauts on the moon in 1969, the agency made several more missions to the moon in the 1970s.