The most commonly used objective lens, especially in Biology, is oil. This is because oil, unlike other liquids like water, has very little light refraction.
The 12 most commonly used Interjections:yesohyeahnoheyhihellohmmahwowouchhurray
what are the most commonly used price indexes
What is the most commonly used e-communication
Arabic is the most commonly used language in the Sahara.
I believe that Crest is the most commonly used toothpaste in America.
The most commonly used sclerosants are ethanolamine and sodium tetradecyl sulfate
Interjections are most commonly used in speech or dialogue.
"E" is the most commonly used letter in English. "S" is the most commonly used first letter for words.
The second most commonly used vowel in English is "E".
Not having statistical information, I believe "and" would have to be easily the most commonly used conjunction.
wood, petroleum distillates, natural gas and coal are the most commonly used fuels
Acetazolamide (Diamox) is the most commonly used carbonix anhydrase inhibitor.