20 points! . 1. read the following sentence and answer the question. "it is not right to make a promise unless one is sure he can fulfill the promise." which of the following is the adverb clause in the sentence? a. can fulfill the promise b. is not right c. is sure d. unless one is sure he can fulfill the promise 2. read the following sentence and answer the question. "it is not right to make a promise unless one is sure he can fulfill the promise." which of the following is the infinitive in the sentence? a. to make b. it is c. is sure d. can fulfill 3. read the following sentence and answer the question. "our old automobile, driven 100,000 miles, was sold to a junk dealer." which of the following is the main clause in the sentence? a. our old automobile was sold to a junk dealer b. driven 100,000 miles c. our old automobile, driven 100,000 miles d. was sold to a junk dealer 4. read the following sentence and answer the question. "our old automobile, driven 100,000 miles, was sold to a junk dealer." which of the following is the correct description of the words "driven 100,000 miles? " a. an adjective clause modifying automobile b. a noun clause as an appositive of automobile c. a gerund phrase as an appositive of automobile d. a participial phrase modifying automobile