Moses speaks to the Israelites as if they were one man, so all instances of "you" and "your" and the words "lift," "look," and "be drawn" are singular.
"all the multitude of things in the sky" or "all the army of the heavens." Here this refers to the lights we see in the sky, including the sun, moon, stars. They are called the host because there are so many of them, just as armies have many soldiers.
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