This sign means______.
How much time did you spend the new words in Unit 10?
---Someone is knocking at the door. Who may it be? ---It ______ be Tom. He is still in the school.
---Have you seen Dr. Adams recently?---No. He __________ Hong Kong for an important meeting. He’ll come back tomorrow.
--- Would you come back to have dinner with us this evening? --- I’d love to, ______ I have an important meeting .
There __________great changes in our hometown in the past fifteen years.
means______. means______. 
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