Select the two words that make up the complete subject. Mr Randall canceled the picnic because of the thunderstorm warning.

Mr Randall and warning are the two words that make up the complete subject.

Explanation:

“Mr Randall canceled the picnic because of the thunderstorm warning”.

Mr Randall and warning are the words that make up the complete subject. The complete subject is defined as simple subject and the words that modify or describe it.

Each and every sentence is made of two basic parts like the complete subject and the predicate. The complete subject contains the main noun in the sentence. The predicate contains the verb or action in the sentence.

faulty parallelism is a construction in which two or more parts of a sentence are equivalent in meaning but not grammatically similar in form.

the correct version of this faulty parallelism in the sentence is:

the hikers knew that the hike was six miles, that it usually required the entire day, and it would not be wise to start after 10: 00 a.m.

the problem is the last sentence, the first two have a basic subject+verb+object structure.

so, to give a proper balance to the structure, or better said, to give a parallel structure, we must write a basic s+v+o structure in all three sentences:

the hikers knew that the hike was six miles, that it usually required the entire day, and it would not be wise to start after 10: 00 a.m.