The words must be placed in the boxes that correspond to the vowel sound they present, so we can organize the boxes as follows: 1. Counter: fountain, douse, foul. 2. Hoist: turmoil, joint, coil.
To find the correct boxes for each word is very simple, you just need to follow the following steps:
Say aloud each word in the box.
Pay attention to the sound of vowels when they are pronounced.
Say aloud the words that are outside the box and pay attention to the sound of their vowels.
Put words that sound similar or the same together in a box.