retain: The traditional markets retain their appeal to many Chinese.

sustain: An unshakable faith sustained him in hardships.

maintain: The two countries have always maintained close relation.

reserve: I have reserved a table at the restaurant.

conserve: Mommy has to conserve fer energy for more important things.

populate: The island were gradually populated by settlers from Europe.

dwell: Too often Dr. Johnson's lectures dwell on how to protect the doctor.

layer： A fine layer of dust covers everything.

perish: If unity is sought through struggle, it will live; If unity is sought through yielding, it will perish.

expire: My season ticket will expire this week.