The teacher, with 6 girls and 8 boys of her class, _________ visiting a museum when the earthquake struck.
Only when they were told of the importance of time ________ wasting time is like wasting part of their lives.
You shouldn't leave the water ________ while you wash clothes; it's a waste of water.
There is no experience you can have ________ is more exciting than skating on real ice.
I hear you are saying that doctors should be highly paid, and this is ________ I disagree.
—I'll tell something about the change in your job tomorrow. —You ________ me some time earlier.