1. He needs to study hard. 
   他需要努力学习
2. Efforts should be made to study and develop the products that meet the material and cultural needs of the old people, encourage and lead the development of the market centering on the old-age household consumption; 
   研制、开发、生产适宜老年人物质和精神需求的产品，鼓励和引导老年用品市场的发展。
3. We must orient our products to the needs of the market. 
   我们必须使我们的产品适应市场的需要。
4. They made detailed investigations acquaint themselves with the needs of the rural market. 
   他们做了细致的调查，来了解农村市场的需要。
5. They made detailed investigations to acquaint themselves with the needs of the rural market. 
   他们进行了详细的调查来了解农村市场的需要。

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