B) Give the correct form of the verbs in brackets. Do not refer to the passage until you finish your exercise. 用括号中动词的正确形式填空，完成练习后再对照课文，核对答案。
1. I never (forget) that day. Since then, I (want) to help others too. I signed up with Blue Sky Rescue in 2009, and I (be) a volunteer ever since.
2. We (be) to schools and other communities to teach children and adults how to stay safe and prepare for the worst. We also (rescue) people during emergencies. We (provide) medical aid and (search) for missing people after natural disasters, like the 2013 earthquake in Ya'an and the typhoon in the Philippines in the same year.
3. Working as a volunteer (teach) me many practical life-saving skills. It also (help) me understand the power of teamwork because it's the key to successful rescues. Most of all, being a volunteer (teach) me the value of every life.
4. But our goal always (be) to save as many people as we can. I'm just an ordinary person, but I'll rush into danger, just like everyone else in Blue Sky Rescue. To the people we (save) and their loved ones, I know we're their heroes.

IV. 1. have, forgotten, have wanted, have been 2. have been, have, rescued, have provided, searched 3. has taught, has, helped, has taught 4. has, been, have saved