6.After several years of observation,the research group ______ the conclusion that language acquisition is faster when students ______ to the situation where it is spoken.( )
8.It has been announced by our provincial government that another two medical teams will be sent to ______ the injured people in the severe earthquake.( )
9.______ the aids from the outside,the positive attitude of the disaster-stricken people _____ the key role in the reconstruction of their destroyed towns and villages.( )
10.By careful observation and precise calculation,Nicolaus Copernicus _____ that there is no one center in the universe and the sun is the center of the solar system.( )
30.The children next door often play the football in the garden after my house and sometimes break my windows.Last Saturday afternoon I stay at home and read a book.After while, I closed my eyes and went to sleep.A loud knock on the door made me wake up suddenly. Soon a little boy turned out."You haven't broken one of my window again?"I asked."Oh,no!" answered the boy."Your windows are all opened this time and our football was in your bedroom. Could you mind getting in to get our ball?"I was at a loss at the moment.