on any given day

Example 1: On any given day, you can find me reading a book at Starbucks. I go there almost every day to study.

Example 2: There are lots of street performers on the Venice Boardwalk. If you go there on any given day, you'll certainly see something interesting.

Explanation:
on any given day is used the same way as any day. 

This idiom can be found in Reading Horizons 1st Edition which is used to teach Reading/Vocabulary in level 6. For more information, please visit www.languagesystems.com

on the spot

Example 1: Greg asked Jan to marry him and she said yes on the spot. She didn't need time to think.

Example 2: In the United States, it's customary to open gifts on the spot, as soon as they are received.

Explanation: on the spot can be used the same way as you'd use the word immediately

In example 1, Jan said yes immediately to Greg's proposal. In example 2, it explains how Americans usually open gifts immediately after they are received. 

This idiom comes from Reading Horizons 1st Edition which is used in the level 6 Reading/Vocabulary classes. For more information, please visit www.languagesystems.com