They _________ the plane, or perhaps they have been prevented from coming for some reason

oks as if it’s going to rain, but I’m not surewhether the windows are shut in my apartment—You aswell go back to have a look

The chemistry teacher demanded that the laboratoryreport _________ immediately after the experiment was done.

Tom havecome in personHe came such a long way just to tell us meresult

Which of the following words comes first in the English dictionary (字典)