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答案解析:
1.答案:be committed/devoted to researching energy-efficient/energy-savingproducts//devote themselves to researching energy-efficient/energy-saving products
详解:
考查固定搭配:“致力于”的固定搭配是be committed/devoted to或commit/devote oneself to.其中to是介词，后面要跟名词性成分，故用名词或动名词。
考查固定表达:“节能产品”的表达为energy-efficient products或energy-saving products。
2.答案:everyone(should)turn/hand in homework/assignments on time
详解:
考查虚拟语气:ask,advise,insist,order,suggest,command,demand,propose,require,desire等表示主管判断，推测，建议，命令和要求的动词引导的宾语从句中要用虚拟语气，从句中的谓语应为“(should)+动词原形”。
考查固定搭配:“提交（作业）”的表达为turn in或hand in。
考查词组:“按时”的表达为on time。
