Our bad living habits will destroy the earth.Only by changing ______ we live can we save the earth.
The hard-working peasants and their happy life _____ we saw in the countryside made a wonderful impression on us.
Ms. Claire is a strict but kind teacher, _____ who, usually, _____ her students.
You will have to wait for one more week, _____ the manager will be back from his trip.
Tom did not take away the camera because it was just the same camera _____ he lost last week.
On a rainy day I was driving north through Vermont, ______ I noticed a young man holding up a sign _____ “Boston”.