_______ the secret of nature, the young scientist haslittle time for entertainment.

164 It is said that the headmistress _____three months ago will soon _____

With the land of the city becoming rare, more and more high-rise buildings are under construction around the Jingmen City ___________ space.

Chinese students have weeks in the summertime than American students.

When I came into the classroom this morning, it ______ me that I had left my book in my dormitory