I have no idea _______ they will pass the final exam. 
#67976
A
that
B
when
C
why
D
whether
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We would like to drop in at your house if ___________     
#69786
A
you are convenient
B
it is convenient of you
C
it is convenient to you
D
you will be convenient
On returning from work, _____.  
#70204
A
John found a letter in the mailbox
B
a letter was found in the mailbox  
C
a letter was in the mailbox
D
the mailbox had a letter in it
—Do you think if Tom          the work well?—I think he will if he          his best.
#40997
A
does, will try
B
will do, tries
C
does, tries
D
will do, will try