根据所给汉语注释，写出各单词的正确形式。
The famous doctor has much experience__________(处理) with urgent problems.
Motrer tells the children not to shout too ________（大声地）in the hospital.
The air pollution in this area caused the ________(死亡) of many trees.
Reading is _______(有帮助的) to improve your writing skills.
Linda __________(拒绝) to help me with my homework last week