Question

One problem is that it Blank 1 of 2
to send every item into space that astronauts might need. 3-D printing is a solution because it is Blank 2 of 2
than sending every item that astronauts might need.

Answer 1

Blank 1: "is expensive"
Blank 2: "cheaper"

Full sentence:
"One problem is that it is expensive to send every item into space that astronauts might need. 3-D printing is a solution because it is cheaper than sending every item that astronauts might need."