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On Friday, May 4, millions of kids throughout the world will celebrate Space Day. Space Day recogni...

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as far as    provided    unless    supposing  
may  can  can't  mustn't  
If only  The moment   On condition that  Now that  
It lost millions of customers.  Its Gmail system collapsed.  Its market application program failed.  Its servers were destroyed by hackers.  
No, you mustn't  Yes, you may  No, you don't have to  Yes, you need  
If only    Unless    On condition that    Now that  
No, you mustn't  Yes, you may  No, you don't have to  Yes, you need  
If only  Unless   On condition that  Now that  
must    may    needn’t    can’t  
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