根据句意及汉语的提示，补全单词。

1. The doctor felt the child's _____ (前额) and found the fever was gone.

2. She died of a heart _____ (疾病发作).

3. His i_____ (伤害) was bad, so he went to hospital.

4. Did you go to the _____ (诊所) yesterday?

5. The _____ (安全) of the players is very important.

若柴油牌号不对，冬季使用夏季用油，则易使发动机不能起动或很难起动。