There were __________ animals in the forest many years ago.
It was nothing but 10 years of hard work that _______his success in business.
Excuse me, could you tell me________?
—Do you like the film 13 Flowers of Nanjing(金陵十三钗)? —Yes, I do. In fact, I've never seen a _______one.
Many people believe _______ robots will do most of our housework in the future.
Nick _______a job, but to our surprise, he didn’t take it.