1 Choose the correct answer. 1) The boy is rather young, he __________ (must / can) get the sleep he needs. 2) I think you __________ (mustn't / can't) exercise regularly. You don't have enough time. 3) __________ (must / can) you cope with the stress? 4) This is his father's iPad, we __________ (mustn't / can't) take it. 5) Our students __________ (mustn't / can't) be late for the classes. 6) The milk is rather hot, but I think you __________ (must / can) drink it. 7) The elderly __________ (mustn't / can't) spend much time in the sun. 8) You __________ (must / can) pay for your gym yourself if you want. 9) __________ (must / can) I use your earphones? 10) I __________ (must / can) work harder to get better results.