What do Don’s words suggest about him? from the monsters are due on maple street

Don is suspicious of Les Goodman.

Explanation:

Don's words suggested that he was suspicious, this is because his questions showed that he was wondering why Les Goodman did not come out or show interest at the thing that flew overhead like everyone else.

Here is an excerpt that shows this:

And [Les Goodman] never did come out to look at that thing that flew overhead. He wasn't even interested.

And [Les Goodman] never did come out to look at that thing that flew overhead. He wasn't even interested.

From this other part he further shows his suspicion by facing the group and asking these questions:

Why? Why didn't he come out with the rest of us to look.

i need for you to know i dont know the answer