- Someone is knocking at the door. Is it Ann?- It_______ be her. She is giving a performance at the theatre now.
---Where is your father? ---He isn’t here. He __________ Yushu to help the people in trouble.
---I will go to Guangzhou this summer vacation. ---__________.
---Why is he so happy? ---He __________ the volunteering club and works for the old people.
---The girl is practicing English, ___________? ---Yes, she is. She is good at English.
---___________ tall building it is! ---It has over one hundred floors.