This gap-fill exercise allows up to four different answers for each space. (For example, try entering "correct", "right", "acceptable" or "appropriate" in the last box.) This makes the exercise much more flexible, and makes the appear to be more "intelligent". However, it involves much more code, which makes for longer processing time when the computer checks , and of course longer download times over the . Also, while four correct answers does allow great flexibility, there are many in which five, six, seven or even of answers would be viewed as correct or acceptable by a human being. A computer can never achieve this level of sophisticated response unless the programmer and materials designer spend inordinate amounts of time trying to predict all the student responses.