Помогите сделать английский язык пожалуйста

The word in capitals at the end of the following sentences should be changed to form a word that fits suitably in the blank space:

1. .... meeting of young people is traditional NATION.
2. Radiation is a ... invisible pollutant DANGER.
3. Radiation causes ... and even death ILL.
4. Great amounts of radiation are ... for the health HARM.
5. ... polluted air can cause illness BAD.

1. This international meeting of young people is traditional. 2. Radiation is a dangerous invisible pollutant. 3. Radiation causes illness and even death. 4. Great amounts of radiation are harmful for the health. 5. Badly polluted air can cause illness.