-May we leave the classroom now? -No, you ______. You ______ to leave until the bell rings.
The model plane is made __________ used wood and glass.
______black—headed gulls(红嘴鸥) come to Kunming to spend their winter every year.
I prefer _______at home rather than ___________ out.
This English book ________Liu Mei’s, it has her name on it.
Something smells ____, and you are supposed to clean your house often.