阅读下面短文，根据文章大意用所给单词的适当形式填空(未提供单词的，限填一词)，使文章意思完整、正确。

    Tina woke up at midnight.  She saw something dive towards the ground. The next morning Tina mentioned it her brother Tom. They decided   (explore) after school.  6 p. m., they reached the forest. They heard some voices  (speak) a strange language. There was an alien standing next to a long spaceship. The children were  (frighten). Suddenly another alien appeared from the bushes in front  them. The children ran in fear. The next morning the children told their parents about the strange (creature), but their dad refused

    (believe) them. Tina and Tom spread their wings and (fly) to school together. Their dad looked at the piece of paper with the strange marks written by Tom. It said "EARTH".