Tidy, save, jail, pack, and away itself.
Also there is clear, stash, aside but they are five letter words.
eat
Cone
Post, as in postcard and posthaste.
An eight letter word for put under stress is "strained."
If by places down one means to put something down then the four letter words are simple. They would be sets, puts or pose.
The letter "I" makes the word "I" and can be put before "attend" to make the sentence "I attend".
four tenths
To cease?
The word its is a possessive form of the pronoun 'it', used as an attributive adjective.It is less awkward than saying 'Put the letter in the letter's envelope' or '... the envelope of the letter'.
Don
No 5 letter word in the English language starts with v and ends with b.
the letter will be thrown away - doh