Final answer:
The sentences can be rewritten using 'get/have something done' or 'need v-ing' as follows: 1. The organizing committee needed to have all athletes tested for performance-enhancing drugs before the commencement of the competitions. 2. They want someone to have the samples examined as soon as possible. 3. The methods of detecting various performance-enhancing drugs need improvement. 4. People need to be educated about the harmful effects of doping.
Step-by-step explanation:
1. The organizing committee needed to have all athletes tested for performance-enhancing drugs before the commencement of the competitions.
2. They want someone to have the samples examined as soon as possible.
3. The methods of detecting various performance-enhancing drugs need improvement.
4. People need to be educated about the harmful effects of doping.