possible shelf drop possible photograph
_____ he was just telling a joke.
The ____ on show told us something about the environment,Don't miss it.
One of the ____ is broken.We have to get a new one.
Michael is very ______ about classical music.
Unfortunately,Linda ____ her mobile phone on the way to her company
打错了 是 knowledge
是knowledge,但是我不知道要不要变形
追答knowing 吧,know about