---How often ___________ the Olympics _____________? ---Every four years. 
#42174
A
is, taken place
B
is, hold
C
does, hold
D
does, take place
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Nobody         what his name is. 
#40648
A
know
B
knowing
C
knows
D
are knowing
My uncle is a writer. He ______ many books since he was young.
#36965
A
writes
B
wrote
C
is writing
D
has written
When ,____your father ____back? When he _________ back, please give me a ring.
#40276
A
does; come; will come
B
will come; comes
C
will; come; will come
D
does; come; comes