—He got his first book published. It turned out to be a bestseller. —When was _____? —_____ was in 2000 when he was still in college. 

Clothing made of man-made materials has advantage over _________ made of natural ones like cotton, wool or silk.

I would like to buy some good English reference books, but _______ was available from the bookstore, where I only found some Chinese ones.

In my opinion, life in the twenty-first century is much easier than ____.

These plants are watered___________.