Evidence has been found through years of study______children’s early sleeping problems are likely to continue when they grow up.

__ astronauts cannot go to a baseball game or amovie in orbit , there are many familiar activities that they can still enjoy

There goes the bell. Hurry up, _______you’ll be late forclass.

ptember 2008 , China’s key milestonein space travel_____when Zhai Zhigang conducted the first space walk

No one was sure exactly__________ he wanted