Amy joined a painting group but didn’t seem to _______, so she left. 21世纪教育网
He was born ____ a very cold night _____ December.
When he knocked at the door, my mother was busy ____ supper.
He waited until it was dark ____ nobody could see him clearly.
Now there are many _____ in our company.
We should think of ways to stop the waste from the factory _____ our living environment.