小题1:Don’t bother yourself about cloning my pet cat. I won’t expect to bring it back to life.
小题2:It occurred to her that she left her key at home.
小题3:My house is nowhere near the center of the city, but it has no air pollution or traffic jams.
小题4:It was long before I realized my mistake.
小题5:If only I had followed the doctor’s advice earlier.