Share Deduction and Posibility
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I am not sure but I thing this gold -------- may not / can´t be -------- real
may not
Reading in bed at night --------can / must --------help you fall asleep quicker
can
I don´t know what is in the box. It -----could / can --------- be a present
could
Harry failed two exams. He --------couldn´t / can´t be -------- very happy
can´t be
Have a drink of water. You -------- might / must------ be very thirsty after the match
must
The doctor is not very sure. She says it --------might / must -------- be serious
might
