It has been announced that candidates ______ remain in their seats until all the papers have been collected.  
#90276
A
can
B
will
C
may
D
shall
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— We expected you yesterday.— I'm sorry, I        you to say that I couldn't be here until today.
#86447
A
must have called
B
would be calling
C
could have been calling
D
should have called
________ your letter, I would have started off two days ago.
#87250
A
If I received
B
Should I receive
C
If I could have received
D
Had I received
I lost your address, otherwise I____you long before. 
#89901
A
had visited
B
have visited
C
would have visited
D
should visit