Although you may meet some difficuIties,you should never .
---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.