Which of the following verb undergoes a stem change in the preterit

Lesson 6: mis vacaciones unit test 1. ellos al teatro en la ciudad. 2. visité 3.yo a montar a caballo durante las vacaciones. 4. temprano 5. temprano 6.how would you say "i visited carlos" in spanish? 7.if you want to see an obra de teatro , where would you go? 8.which indigenous group is believed to have inhabited la república dominicana before the arrival of the spanish to the new world? 9.how would you say "they went to the museum" in spanish? 10.which is the word for "to rest" in spanish? 11.which is the word for "to rest" in spanish? 12.las niñas a montar a caballo. 13.in which place can you see un oso? 14.which of the following was named after eugenio de jesús marcano fondeur? 15.in which place can one see professional sports being played? 16.what was salomé ureña de henríquez' main cause in her life? 17.which of the following is not an animal? 18.where do many of zoodom's animals come from? 19.which of the following is a likely question that could be answered by saying " 20.which of the following cultures did not influence dominican cuisine? 21.what can visitors see and do at la caleta national marine park? write your answer in english. 22.explain what common forms of transportation can be used in la república dominicana, and how do such forms compare to those of the u. s.? write your answer in english. 23.how does zoodom foster education and research? write your answer in english. 24.when should the personal es be used in a sentence, and why? write your answer in english. next, write a complete sentence in spanish that uses the personal 25.what is the importance of coconuts in la república dominicana? write your answer in english.