Some government officials in the USA have pointed out that the death of Osama Bin Laden means keen vigilance (警戒) _____ the end of terrorism.
________ which university to attend, the girl asked her teacher for advice.
George returned after the war, only ________ that his wife had left him.
He got up late and hurried to his office, ________ the breakfast untouched.
I made every effort to get the car out of the mud, but it remained ________ there.
—What on earth made Susan weep? —________ of cheating in the exam.