听音，找出句子中含有的单词，将序号写在前面的括号内。（共10分）
（1）A. delicious            B. different              C. difficult
（2）A.a letter             B.an email                C.a present
（3）A. reading books        B. listening to music      C. playing computer
（4）A. Christmas           B. Halloween              C. Thanksgiving
（5）A. is eating           B. is sleeping            C. is running