His writing is so confusing that it’s difficult to make out ________ it is he is trying to express.
Working hard is not only a _____ of great success, but it is among the essential requirement.
We were strongly recommended that we _____ in Malaysia.
_____ in Harvard is _____ most students wish for.
He didn’t _____ to what I said because his mind was on something else.
People read newspapers and magazines in order to keep themselves _____ of what is going on in the world outside.