It is this kind of exciting trip _____most of my classmates only dream about.
“Got it?” Professor Smith says, “______, let’s move on to the next part.”
By accepting lower prices, organizers can sell tickets that would ______ go unsold.
The lack of health facilities and necessary protection for medical workers partly ______ the epidemic (蔓延) of Ebola.
Dozens of people were waiting with a camera for ______ seemed like hours, hoping to catch a glimpse of the US First Lady, Michelle Obama.
— Can I make an appointment with Dr. Smith this afternoon?— Sorry, I’m afraid he is not ______ because he has a patient to operate on.