How this exercise works

This exercise contains a number of marked sections known as 'gaps'.

You can choose one of a number of options in each gap. The options available may differ from gap to gap, and the contents of any particular option may be plain text, an image or a combination of such elements.

You can select gaps and choose options using the mouse or the keyboard.

Using the mouse

Click on a gap to select it. The selected gap is marked in yellow and the first of the series of options for that gap will appear.

Clicking on the same gap will cycle through the options available for that gap.



Keep clicking on the gap until the option you think is correct is in the gap.

You can cycle through the options as much as you like.

You can visit gaps in any sequence you want, and revisit and change gaps that are not already marked as correct. There are exceptions to this behavior: see the section 'Free and forced sequence' below for further details.

When you have completed all the gaps (or as many as you can) click on the 'Evaluate' button in the control panel. See the section 'Evaluation' below for further details about the evaluation process.

Using the keyboard

In this exercise you can select gaps, set their options and evaluate your answers using the keyboard.

• You can see a list of the keys that are available and their functions in the control panel.
• Some keys enable you to move from gap to gap in the exercise. The currently selected gap is marked in yellow.
• Other keys change the options within the currently selected gap.
• When you use keys to cycle through the options in a gap you can cycle backwards as well as forwards (unlike clicking with the mouse, which only cycles forwards).

Evaluation

There will usually be a limit set to the number of attempts you can make to get the answers correct in an exercise. This number is shown in the 'Number of attempts allowed' field just above the 'Evaluate' button.

• The evaluation process checks whether you have selected the correct option in each gap and marks the gap accordingly.
• If there are any gaps with incorrect options — and you still have some attempts left — you will be invited to try again to set the correct option in each incorrect gap. You can't change correct answers.
• If there are no attempts left and there are still incorrect options in any of the gaps, the correct options will be put into these gaps.
• Gaps are marked in different colours to show whether the answer was correct first time, correct after one or more attempts, or corrected after all attempts had been used up.
• If you have made mistakes try to understand why your answers were incorrect and repeat the exercise. You can do this easily by clicking the 'Restart' button on the control panel.

Free and forced sequence

In most exercises you can work through the gaps in any order. Each evaluation applies to all the gaps, as does the number of attempts you can make to get the exercise correct.

In certain exercises — mathematical expressions, for example — the answer to one gap may depend on the answer to a previous gap. Such exercises will not allow you to select freely the order in which you input the answers.

In these cases each gap has to be evaluated individually. The number of attempts allowed is now the number of attempts you have for each gap, not the exercise as a whole.