从方框中选择合适的词(组)并用其正确形式填空，完成下面的句子。
helping hand; possible; operate; ask for; take part in
（小题1）We all think it______ for us to be a good volunteer without enough knowledge and skills.
（小题2）It is really kind of you lend me a___________. when I am in need.
（小题3）After the __________, the sick boy was out of danger.
（小题4）It is helpful of you _________________ our activity to help the elderly.
（小题5）The boy solved the problem on his own instead of ____________ help from his parents.
【答案】【1】impossible
【2】helping hand
【3】operation
【4】to take part in
【5】asking for
【解析】【1】句意：我们都认为，没有足够的知识和技能，我们不可能成为一名优秀的志愿者。It’s+ adj. + for sb. to do sth.做某事对于某人来说怎么样，此处缺少形容词，结合句意，答案要填写possible的反义词impossible。
【2】句意：当我需要帮助的时候，你帮了我一个大忙，你真是太好了。根据后面的句子“when I am in need.”，别人需要帮助的时候要伸出援助之手，故答案为helping hand援助之手。
【3】句意：手术过后，这个生病的男孩脱离了危险。the后面一般要跟名词，结合句意可知，答案为operation。
【4】句意：参加我们的活动来帮助老年人对你来说是很有帮助的。It’s+adj. + for sb. to do sth.做某事对于某人来说怎么样，动词不定式用作真正的主语，结合句意可知，答案为to take part in。
【5】句意：这个男孩自己解决了这个问题，而不是向父母求助。ask for help from sb.向某人寻求帮助，instead of doing sth.而不是做某事，故答案为asking for。