The girl got nothing in ______ for her kindness, which made her very sad.
35. He was born ____ a very cold night _____ December.
34. When he knocked at the door, my mother was busy ____ supper.
33. He waited until it was dark ____ nobody could see him clearly.
31. We should think of ways to stop the waste from the factory _____ our living environment.
28. As far as I know, this man ____ risk anything than lose the ring for his wife.