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.
Only when I left my parents for Italy____ how much I loved them.
He asked me just to sit down and drink some water ____ I could say anything about my travel plan.
Patience, without ____ you can’t do the work well,is a kind of quality.
— Flight MU257 ______, I must be off now. — Have a nice trip.
I admired my classmate Lisa very much. _____ her prettiness, she was smart and helpful.