답변을 얻은 뒤 반드시 감사의 덧글을 남기고, 좋은 답변은 채택해 주시는 센스...
질문할 때 예의를 지키시기 바랍니다.(빨리... 고수분만..... 이런 식의 요구는 자제 바랍니다.)
질문 내용 : 1.Hope, (it/which) seems like the thinnest little thread, is an incredibly powerful force leading us fromthe most horrible problems intoa bright new day.2. Scientists are developing biofuels to reduce greenhouse gases. Using ethanol from sugar cane,(they/which) can help reduce global warming.3. We humans spend millions of dollars trying to rid ourselves of insects, (some of them/ some of which) are actually essential to our survival.