91．Earth Day is a celebration of life and our planet. It r　　　 　us to care about the world and learn to respect life and nature.

90．Everybody admires him for his fine s　　　 　of humour(幽默).

89．There were so much beautiful j　　　 　that it was hard to choose.

88．Drivers are supposed to f　　　 　their seat –belts while driving on the highway.

87．After the accident with the sled, I s　　　 　to my knees knowing that somehow I had to put my tent up for shelter.

Now satellites are helped to forecast(预报)the　　　　　　　　　　　　 77．　　　 　

weather. They are in the space and they can reach　　　　　　　　　　　　　　　　　　　　　　　　　　　　 78．　　　 　

any part of the world. The satellites take photos for the　　　　　　　　　　　　 79．　　　 　

atmosphere(大气层)because weather formed there. They　　　　　　　　 80．　　　 　

send their photos to the weather station. But scientists　　　　　　　　　　　　　 81．　　　 　

can see the weather of any part of the world.

　　　 Today nearly five hundreds weather stations in　　　　　　　　　　　　　　 82．　　　 　

sixty countries accept satellite photos. Scientists　　　　　　　　　　　　　　　　　 83．　　　 　

compare the new ones from the earlier ones. Perhaps　　　　　　　　　　　　　 84．　　　 　

they may find that the clouds have been changed　　　　　　　　　　　　　　　　 85．　　　 　

during the last few hours. This may mean that　　　　　　　　　　　　　　　　　　 86．　　　 　

the weather on the ground may soon change too.