某社区想扩建一片长方形绿地，如果长增加6米，面积就增加30平方米；如果宽增加3米．面积就增加24平方米，这片绿地的面积是多少平方米？

阅读短文，从方框中选择适当的单词填空。

Some people in Britain and America like to invite friends to dinner at home. But this is more common in America ____ in Britain. Don't worry if your English friends don't invite you home. It doesn’t mean that ____ don't like you.
When you are invited to an evening dinner, ask your friends what ____ you should arrive. It is a good idea to take a small present when you arrive, and it is ____ to say how much you like the house, the room, or the pictures in the room. But don't ask how much these things cost. In this way, ____  you and your friends will have a pleasant get-together.

钟表上的时间为晚上8点，这时时针和分针之间的夹角（小于平角）的度数是（　　）

Is there______ with the machine?