---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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Ken _____ his jacket in the gym. He has to get it back.
#39092
A
left
B
leaves
C
is leaving
D
was leaving
Great changes _________ in Tongren in the past five years.
#42335
A
have happened
B
have taken place
C
have been happened
D
have been taken place
What’s he doing?   He    Tv.
#40597
A
watch
B
watches
C
watching
D
is watching .