问题详情：
单词拼写
17.用括号内所给单词的适当形式填空。 1．Thanks for ______ (give) us a ride to catch the train on time． 2．It’s ______ (usual) for a four-year-old boy to write poems so well． 3．Mary got hurt in P．E．class．We sent her to the hospital ______ (quick)． 4．As a volunteer, it’s the ______ (six) time for him to help the kids in Africa． 5．In China, ______ (mooncake) are the traditional food on the Mid-Autumn Festival．
【回答】
1．giving 2．unusual 3．quickly 4．sixth 5．mooncakes
知识点：构词法
题型：完成句子
