Water had also appeared on other planets like Mars but    1    the earth, it had disappeared later. It was not immediately obvious that water was to be    2    to the development of life.

That afternoon aboard the train, the cousins    3    in their seats. Earlier that day, when they crossed the Rocky Mountains, they managed to    4    some mountain goats and even a grizzly bear and an eagle.

For forty years Jane Good all has been    5    about making the rest of the world understand and respect the life of these animals. She has argued that wild animals should be left in the wild and not used for    6    or advertisements.

Dr Yuan is quite    7    his life! However, he doesn't care about being famous. He feels it gives him less    8    to do his research. He would much rather keep time for his hobbies.

Then he    9    the lace of the shoe and eats it as if it were spaghetti. He eats each mouthful    10    .The acting is so convincing that it makes you believe that it is one of the best meals he has ever tasted.