The Tibetans          in the Himalayas for centuries and have adjusted to the conditions at________.
#102472
A
has live; a such great height
B
have live; such a great height
C
has lived; a such great height
D
have lived; such a great height
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No sound and no voice______ for a while. 
#104900
A
have heard
B
has heard
C
has been heard
D
have been heard
.---David. I’ve lost my keys again. ---Here, not again!You______ your keys.
#103868
A
always lost
B
always lose
C
are always losing
D
had been losing
Please tell Tom not to leave the classroom unless he ______ that all the lights ______.
#100303
A
makes sure; are turned off
B
makes sure; will be turned off
C
is made sure; are turned off
D
will make sure; will be turned off