They demanded that the law on gun ownership _______, otherwise more murders will arise.

—“What courses are you going to take next semester if you want to receive enough credits to get your degree?”—“I don’t know. But it’s about time      on something.”

He commanded that all the gates __________.

Since nobody gave him any help, he    have done the research on his own.

The law of Venice says if anyone tries to kill or murder any citizen of Venice, everything that he owns      be taken away from him.