【推荐1】It is reported that these birds ____________(protect) at present in the area. (所给词的适当形式填空)

【推荐2】To increase the awareness of __________(protect) the environment, last Saturday we, some volunteers, carried out the activity in the Civil Square. (所给词的适当形式填空)

【推荐3】We must _________(protect) against sudden attacks. (所给词的适当形式填空)

【推荐1】Being devoted to ________ (learn) a second language, whether you are old or young, will add to a lot of fun and broaden your horizons. (所给词的适当形式填空)

【推荐2】How many of you have ever consider ______ (quit) our job to pursue your passion? （用所给词的适当形式填空）

【推荐3】The farmer gained a lot of experience by _____ (observe) the growth of his vegetables. (所给词的适当形式填空)