⑴I'm listening to music ____           A. but the teacher comes.

⑵Lucy is playing with her dog,____    B. but my friends come to play with me.

⑶The pupils are talking very loudly,____     C. but her mother calls her.

⑷A bus is coming,____                 D. but it starts to rain.

⑸We are having a picnic,____       E. but there are too many people on the bus.

三峡工程是具有防洪、发电、航运、供水等巨大综合利用效益的特大型水利水电工程，其防洪库容量为22 150 000 000m²，这个数用科学记数法表示为（        ）．

    My mother is very nice. She is a ____ （work） in a clothes store. She usually gets up at 6: 30. Then she cooks breakfast for me. After ____（have） a bowl of porridge and some broccoli, she goes to work at 7: 30. There ____ （be）usually many people in her clothes store. So she is very busy.

    My mother's work in the morning is over at 11: 45, and starts again at 1: 30 in the afternoon. So she has to have lunch in the store. Her work in the afternoon ____ (end) at 5: 30, and she goes home at 6: 30. Then she has dinner with ____ (we）at home. After dinner we watch TV together.