Genius is a complicated concept , many different factors.
I ______ for Beijing in a few days. Do you know when the earliest plane ______?
The computer centre, ____ last year , is very popular among the students in this school.
When the spaceship was , I could really feel the high gravity.
He still remembers the days ______ he spent with your family.
The thieves ran away when the burglar alarm(防盗警报器) .