完形填空

    　Mary and Peter were having a picnic near a river when Mary noticed something flying overhead.“ 1 ,” she shouted to her friends. “ That's a spaceship up there and it's going to 2 here.”

　　Frightened(吓唬) by the strange silver colored spaceship,3 of the young people got in their 4 and drove away quickly. But Peter5 Mary and always close to her. They, more 6 than frightened, watched the spaceship land, saw a door open. When nobody 7 , they went to the spaceship and looked into。In the center of the floor 8 was a pile of food. Peter followed Mary into the spaceship and didn't 9 the door close behind him. The temperature fell quickly and the 10young people lost consciousness(知觉).

　　When they woke up, they were 11to see that they were back by the river 12 . The spaceship had gone. Their car was nearby.

　　“What 13 ?” said Mary.

　　“Don't ask me; perhaps we had a 14 .”Peter said slowly. “Did you … did you see a spaceship?”

　　“Yes,” said Mary. “Oh, Peter, we 15 have seen a UFO coming from another world.”