4. Before you buy a pair of jeans, you should conduct research on the manufacturer to decide whether it is eco-friendly or not.
举一反三
- Before you mail this letter, you should check again whether you have _______ it or not.
- In order to save money, you should （） A: shop around before you decide what to buy B: buy the first item you see in the shop C: buy what other students are buying
- What factors should you consider before you decide which research method to use? A: Research purposes B: Audience C: Availability of data D: Your research skills
- The thing that _____ is not whether you fail or not, but whether you try or not.
- I ___ five minutes to decide whether I should go or not.