---Is it Pro. King that will give the lecture on radiation?--- I can't __ I know it for sure.
I would appreciate ___________, to be frank, if the goods could be delivered as soon as possible.
---- How did it __________ that you made such a silly mistake?---- I myself haven’t figured it out yet.
The water in the river isn’t fit to drink, for you know, it __________.
I hear Mr. Smith was writing a story last year and he still__________.
I haven’t seen _________ Maggie since I came here.