—Mr. Wang is in Nanjing for a trip.—Oh, really? When ______ he ______ the trip?

There is little doubt in your mind that he is innocent, ________/

“Where _______ go to work？” “Where _______ go to work is not known.”

. Miss. Richardson knows much about the novel. I suppose that she must have read it, _______?

—Haven’t you been to Beijing before?—       . I went there last summer.