He’s already left here. You ____ have come here half an hour earlier.
A．oughtB．mustC．should toD．ought to
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Such a good opportunity may not come again, so you ____________ let it go this time.
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---Answer the doorbell, please. It must be your uncle.
---It   Heidi. She’s coming over this morning to help me with my math.
A．isB．can’t beC．could beD．will be

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we___________last night,but we went to the concert instead.
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Only when ____hard____make your dream come true. 
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