用所给动词的适当形式填空。
(1)He____ (prefer) outdoor activities to films last year.
(2)No country ____ (make) such great progress as China in the past thirty years
(3) I called you this morning, but nobody answered it. Oh, I ____ (iron) shirts in the bedroom.
(4)We should prevent air pollution ____ (live) a happier life.
(5)We hope that more charity shows ____ (hold) to raise money for Project Hope.

一种动物如果没有了对手，就会变得死气沉沉；一个人如果没有了对手，就会甘于平庸；一个群体如果没有了对手，就会因为相互的依赖和潜移默化而失去活力。生活中需要对手，因为对手（      ）

①赋予我们压力和动力                      ②能激发我们的潜能

③是事业成功的必要保障                  ④能让集体更富有生气

面对新的环境，我们需要通过改变自我形象来适应。（    ）