In the Central Highlands, the biggest and tallest house in the village is the ______ house. A. communication B. communal C. commune D. community 45. When having meals with a British family, you should never chew with your ______ open. A. hand B. eye C. finger D. mouth 46. You ______ use your mobile phone on the plane. A. must B. mustn’t C. don’t have to D. have to 47. You ______ break you promise to the children. A. should B. shouldn’t C. must D. have to 48. She's always tired. She ______ go to bed late every night. A. can B. can’t C. should D. shouldn’t 49. My brother ______ work late tonight. His boss ordered him to stay until 10.00. A. must B. have to C. has to D. should