1) She ___ be at home because her car is not here. a) might b) could c) must d) can't 2) He ___ be the new manager; he looks too young. a) must b) may c) can't d) could 3) They ___ be on vacation since their house is dark. a) might b) must c) can't d) could 4) This ___ be the right address; the numbers match. a) may b) must c) can't d) could 5) She ___ know the answer; she studied hard. a) must b) might c) could d) can't 6) It ___ rain later, so take an umbrella. a) may b) could c) must d) can't 7) He ___ be tired; he slept all day. a) must b) can't c) might d) could 8) They ___ be at the meeting; I saw them leave. a) may b) can't c) could d) must 9) This ___ be the correct key; it fits perfectly. a) could b) can't c) might d) must 10) She ___ be the one who called; her voice is different. a) must b) may c) can't d) could 11) He ___ be at the office; his car is parked outside. a) could b) might c) can't d) must 12) They ___ be playing outside; it's raining heavily. a) must b) can't c) may d) could 13) This ___ be the right way; we are lost. a) might b) can't c) must d) could 14) He ___ be joking; he looks serious. a) must b) could c) can't d) may 15) They ___ be at home; the lights are on. a) could b) might c) can't d) must 16) She ___ be tired; she just woke up. a) can't b) might c) must d) could 17) He ___ be the one who left the door open; he was the last to leave. a) might b) can't c) could d) must 18) They ___ be at the park; it's too late. a) can't b) must c) could d) may

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