Choose the word or phrase that best completes each sentence below. giúp em đi mn 21. Mai doesn't feel well. She's got a stomachache. She ______ take a painkiller. A. needs B. should C. shouldn't D. mustn't 22. People _______ break their promises. It's not a good habit. A. should B. shouldn't C. must D. may 23. Hung's bedroom is very messy. His mother advises him that he ______ tidy his room more often. A. should B. shouldn't C. must D. might 24. The roads are very icy at this time of the year. We ______ drive too fast not to have an accident. A. don't need to B. don't have to C. should D. shouldn't 25. There's an important exam tomorrow. They ______ study now. A. should B. shouldn't C. need D. ought 26. My mother is carrying a heavy bag. I ______ help her. A. need B. may C. won't D. will 27. The alarm's going off so noisily. I ______ switch it off. A. need B. won't C. will D. shouldn't 28. He said to the waiter, "I ________ have a sandwich and a coffee." A. won't B. will C. shouldn't D. should 29. I'll have an English class tomorrow. I ______ leave the house until I finish my homework, so please don't try to ask me out. A. must B. should C. will D. won't 30. The window is open and it is very cold. I ______ shut the window. A. will B. won't C. shouldn't D. might