为下列句子选择正确的答语。
A. I'm doing my homework.
B. Thank you.
C. Yes, he is.
D. She's going to Shanghai.
E. Yes, they are.
1．Are they going to the cinema? （______）
2．Where is Zhang Lanlan going? （______）
3．What are you doing? （______）
4．Is he going to do exercise? （______）
5．Happy birthday! （______）
B. 
C. 
D. 
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