18. What must the president do "from time to time”?

Explanation:

The President will tell Congress how the country is doing in a “State of the Union” speech from time to time. The President will also give Congress ideas about how to get things done; and the President can meet with Congress anytime it is really important.

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in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".