阅读短文，选出合适的词，将单词写在横线上。
sad, sweet, grapes, cannot, round
One day，a fox sees some nice 1.________．They are purple and 2.________．But the grapes are high．The fox 3.________get and eat them．A bird can eat the grapes．She likes the sweet grapes．The fox is 4.________and angry. He says those grapes are sour. They are not 5.________.
