With time going by, we have come to realize that creativity is _______it takes to keep a nation highly competitive.
The 29th Olympic Games ____ in Beijing in 2008.
—Did you visit the museum today? —No. We _____ it, but we spent too much time shopping.
The school is _____ a Chinese teacher for the new term who masters the English language perfectly.
He is always helping people without expecting anything _____.
It is known to us that lions and tigers _____ the cat family.