Fill in the Blanks Modals of possibility and/or certainty (1)Online version Students have to select the right modal to complete the sentences. by Sarah Muyshondt 1 could must may can might Tourists be certain to see the Crown Jewels at the Tower of London . 2 could might must may can The restaurants in the city be open today , it is Saturday ! 3 might could must may can Tourists prefer to go by foot rather than using the London Underground . 4 can could may must might People who are afraid of heights , not want to visit the Big Ben . 5 could must might may can Some people be annoyed when you ask them to take a photo of you in front of Westminster Abbey .