【正文】
Fill in blanks with proper modal verbs. Can would could have to should might/may must When it es to saving the earth, people _______ think that big things __________be done. However, many fet that saving the earth begins with small things. For example, You _________ save electricity by turning off the lights when you leave a room. You ____ also use paper or reusable bags instead of plastic bags. In some stores, you now __________ pay for plastic bags. I think this is a great idea. And instead of driving to school or work, you ________ ride your bike or walk. If it’ s far, you ________ take the bus. All these small things ______ add up and became big things that _____________ improve the environment. We can’ t afford to wait any longer before taking action. Possible answers: may, can’ t, can, could, have to, may/might, should ,would, must 課堂活動 Step 4 Activities\ In your group make a list of things people can do to