31.The lecture mainly deals with the trouble young children have right from wrong .
She usually keeps her valuables, such as jewels and money, ________ she believes secure.
How can they expect to learn anything ________ they never listen?
—I wonder how much you charge for your services. —The first two are free ________ the third costs $30.
—I think George doesn't really care for TV plays. —Right, ________he still watches the program.
After the war, a new school building was put up ________ there had once been a theatre.