完成句子
Police have appealed for __________ (目击者）the accident.
Dan gave __________ (大叫）delight when Jason scored a goal.
Many German artists __________ (逃到）America at the beginning of World War
She is taking care of the baby __________ (被父母遗弃的).
The old man stood at the stairs, __________ (停下来喘气).
Is there anything I can do __________ (帮助你摆脱困境)？
The boy was __________ (整理）the foreign stamps that he had collected.
The organization called on the public __________ (保护环境).