John is very busy. He _____be in the office.I'm not sure., must, can't, may, That__________be his sister. His sister has gone to Australia., must, can't, may, Mr.Black ____be working in the office. It's Sunday today., must, can't, may, He____ be at home, must, can't, may, It ____ John's bag. I can see his name on it., must, can't, may, ?, Is he reading in the library? He _____be reading at home. We're not sure, must, can't, may, What's in the box? I'm not sure. It _______be a gift from my uncle., must, can't, may, Is the girl in red Kate? No, It___be Kate. Kate wears a white dress., can't, must, may, Mike worked late last night. He ___tired now., must, can't, may, Ann is a middle school student. She _______be thirty years old., must, can't, may, My grandfather __be reading. He is in the library., must, can't, may, It ___be her new car. I saw it a year ago., must, can't, may

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