19.There are two buildings, ____ stands nearly a hundred feet high.
________ at the cafeteria before, Tina didn't want to eat there again.
The traffic problems we are looking forward to seeing ________ should have attracted the government's attention.
Jim was about to stand up when he saw something ________ near his feet. It's a snake!
David threatened ________ his neighbour to the police if the damages were not paid.
—Robert is indeed a wise man. —Oh, yes. How I regretted ________ his advice.