What rule applies to this word?
exhaust
Group IV. When the root has other forms built on the letter a, the -able form is used.
Group VII. When the word has an immediate -tion form, -ible is used.
Group V. When the root ends in hard cor hard g. -able is used.
Group II. When the root is a full word except for a final e, the forms usually are spelled with -able.
Group VI. When the root is not a full word, -ible is used.
Group VIII. When the root ends in ns, miss, or soft cor gible is used.
Group I. If the root is a full word, the ending is usually -able.
Group III. The suffix -able always follows i.

Read the passage. the dust bowl during the 1930s, extreme drought and high winds made life incredibly difficult in the great plains region of the united states. in many areas, rainfall was forty percent less than normal. the soil became extremely dry, and when strong winds blew, they created tremendous dust storms. these so-called “black blizzards” were so thick that they made daylight seem like dusk. during this terrible period, the great plains region of the united states was named the “dust bowl.” over the next few years, the drought continued, and the winds created more dust storms. in some places, the drought and high winds lasted for eight years. many people wondered if the black blizzards would ever end. which statement about this paragraph’s main idea is true? this paragraph’s main idea is stated in the topic sentence. there are not enough details to support the main idea. this paragraph’s main idea is implied. this paragraph does not express a main idea.