Final answer:
Dependent clauses are groups of words that do not express a complete thought. Two correct dependent clauses in the given options are 'When the teacher arrived' and 'Unless something better happens'.
Step-by-step explanation:
Dependent clauses are groups of words that contain a subject and a verb but do not express a complete thought and cannot stand alone as a sentence. In the given options, the two correct dependent clauses are:
- When the teacher arrived: This clause begins with the subordinating conjunction 'when'. It cannot stand alone as a sentence because it does not express a complete thought.
- Unless something better happens: This clause begins with the subordinating conjunction 'unless'. It also cannot stand alone as a sentence because it does not express a complete thought.
The other options are not dependent clauses because they express complete thoughts and can function as independent sentences.
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