When you read a book, you are likely     1    (notice) that a brand new book has a rather special smell,     2    differs from that of an older book. Where does it come from? The answer is simple—the paper, the ink and the glue.

Around 200 AD, the Chinese first came up with paper, one of the greatest     3    (invent) in the world. It is made from wood. The wood must be processed with various chemicals     4    (add) to change its structure, to remove acid and to whiten the paper. Then comes the ink—there are many kinds. Some fade with time,     5     others get darker than years ago. Finally, different glues     6    (use) to join the sheets together and attach the covers, whether hardcover     7     paperback. Therefore, you can smell different chemicals coming out of your new book.

Today, the forms of books     8    (change) greatly ever since the birth of eBooks. They might be     9    (convenience), but you can't give your copy to others     10     a present, and they don't smell as nice.

Nowadays, more and more people enjoy watching plays in the theater, so do my wife and I. We’ll go to the theater whenever we have time. But before we buy tickets, we would like to know whether the play is good or bad. In other     1     (word), when a new play comes, we usually decide whether to watch it or not according     2     the information about it on the newspaper. Last week a new play was put on in the theater. The newspaper said it was very     3     (interest), so we planned to go on Saturday night. It took my wife a long time     4     (make) her decision about what to wear and we left our house a little late. By the time we got to the theater, the first act     5     (start). To our relief, we     6     (permit) to enter the theater. When we found our seats, we were recognized by an old friend,     7     seat was next to mine.     8     (short) after the play was over, we went dancing. By the time we got home, it was about two o'clock in the morning. I’m not used to staying out so late and I was extremely tired.

I didn’t have the money to go out for an evening like this     9     I was younger. Now I can afford it, but I don’t have the energy to enjoy     10     (I).