Double click on the gray area and the options form appears. Add the answer and distracters in the Item drop-down list. Follow the same procedure for the second error. For fill in the blank items, select the item to be replaced and insert a Text form. For example, the following sentence contains a blank.
Students fill in the blank with the correct word.
To make this an online form, simply replace the blanks with Text forms. Select the first blank and then press the Text button. The underline is replaced with a gray area. Then press OK two times. Do the same thing for the second blank.