给下列句子选择正确的答语。
1.（   ）What are you doing?   A  Yes, they are.
2.（   ）Is her birthday in June? B  It's May the 5th.
3.（   ）What's the date? C  I'm answering the phone.
4.（   ）What do you do on the weekend? D  Yes, it is.
5.（   ）Are they doing an experiment? E  I often go hiking.