Dogs are very popular pets all over the world.  Some people keep dogs because the dogs help them.  These dogs may __21___someone’s house.  They can also help a __22___ man by leading him to places __23__ he needs to go.  Other people keep dogs as pets __24___ they like dogs.  Almost 33 percent of the homes in the USA and England have dogs, and these dogs come in __25____ kinds of shapes and sizes.
By all accounts, the largest dog in the world is a dog named Zorba.  This dog is a mastiff that lives in London, England.  When it was 7 years old in 1989, it was 92.5 centimeters tall.  In __26___ words, it was more than half as tall as an adult man.  Some Great Danes can grow taller than 98 centimeters, but they do not grow as large as Zorba.  At its __27___ ,Zorba weighed more than a heavyweight boxer at 156 kg.
However, the __28__ dog was a Yorkshire terrier from England.  This dog was only the __29__ of a matchbox measuring 5 centimeters tall and, at most, 8 centimeters from nose to __30__.

_______ great fun it is to play games on _______ QQ!

A. How;  /                B. What; the               C. How; the          D. What; /