Complete the sentences using the affirmative or negative form of the verbs (Hoàn thành các câu bằng cách sử dụng hình thức khẳng định hoặc phủ định của động từ) 1. It's cold today. You should … 2. You can … many vegetables as they are good for your health. 3. You must … soccer in this restricted area. 4. You have … hard so as to get high grades. 5. You ought … these fairy tales to build your imagination. 6. You can … faster if you have lighter shoes.