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If (如果) you have problems (问题)，you can ask Tom _____ help.
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What happened _______ you?
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The accident happened         a cold winter early morning.
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---How do you learn English? --- I learn English__________ making flashcards..
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 In Britain, people won’t touch you or push past you if you’re _________.
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in some ways
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– When do you exercise every day? -- __________the morning.
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