Mary and Peter were having a picnic with some friends near a river when Mary shouted,"Look!That's a spaceship  up there and it's going to land here." Frightened  by the strange spaceship,all the young people got into their cars and drove away as quickly as possible except Peter and Mary. They were more curious   than frightened. They watched the spaceship land and saw a door open,but nobody came out,so they went to look into it. In the center of the floor,there was a lot of food. Peter followed Mary into the spaceship and did not hear the door close behind him. The temperature fell in no time and very soon the two young people didn't know anything. When they came to themselves,they were surprised to see that the spaceship disappeared, their car was near them. "What happened?"asked Mary. Peter scratched   his head,saying slowly,"Don't ask me. Perhaps we had a problem. Come on. It's time to go home." After driving about fifty meters,they found a thick wall made of something like glass stood in their way. On the other side of the wall,a few strange aliens  were looking through the wall and reading a notice,it said,"New comers at the zoo: a pair of earth villagers with their _ ." How did Peter and Mary feel when they saw the strange spaceship?  They felt   _  .
frightened surprised amazed curious