6. Wortschatz
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Instruction
    To start this practice, press "BEGINN". You are
supposed to try 10 quizzes as default. Of course, you can change
the number of quizzes, entering the number in the textfield. Then,
you will see the question in the textarea under it. Enter an answer,
and press "OK". Then, you will see if your answer is correct.
To continue, press "NAECHSTE".
    If you make some mistakes, you will see a window
at the end to confirm if you do over them. If you want, press "OK".
If not, press "CANCEL".
    If you want to practice again after you complete,
press "BEGINN". Another new practice using other quizzes will start.
    I hope the practice above helps you extend your vocabulary.
Try the quizzes repeatedly.
    This practice consist of just 1 source file of
HTML&Javascript. Therefore, if you want to change quizzes, save
this source file and open it by an editor SW such as "notepad".
You will find
substitutions to the arraies of "t[i]" and "a[i]" after 25th line.
"t" is for questions, and "a" for answers. Change texts between "
and ". In addition, change the value of N at 12th line to agree to
the number of questions, too. Of course, to do that, you need a bit of
computer skills although it's not so difficult.