用be动词的适当形式填空。(30分)
（1）A：________ you at home yesterday?
B：Yes，I________．
（2）A：________ it sunny in London now?
B：Yes，it________．
（3）A：________ you at the park now?
B：Yes，we________．
（4）A：________ your mother out yesterday?
B：Yes，she________．
（5）A：________ they at school yesterday?
B：Yes，they________．