First answer to the first question will be a. an art show. Second answer will be b. It comes from a Latin word meaning "sand." Third answer is b. Christine.
The detective continued to search for the missing girl.
infinitive: to search.
infinitive phrase: to search for the missing girl.
Just when he started to doubt his plan, he found the scared young girl behind the door to the cabin.
infinitive: to doubt.
infinitive phrase: to doubt his plan.
Testimonial - a written declaration certifying to a person's character, conduct, or qualifications, or to the value, excellence, etc., of a thing; a letter or written statement of recommendation.