Pick up scraps of paper, packaging bags, coke bottles, beer lids, garbage, sticks, branches, rags, sunshine, memories, etc.
He crouched down and picked up the pen from the ground.
He picked up the book that had fallen from the ground.
He calmly tidied up the papers on the desk as if nothing had happened.
Xiao Ming saw the books on the desk at sixes and sevens and took the initiative to tidy them up.
So he picked up his hat and walked out of the office.