A major search has been_____ for  a Malaysian Airlines jet with 239 people on board after it lost contact flying from Kuala Lumpur to Beijing.
#63752
A
identified
B
launched
C
substituted
D
dissolved
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They ______Hong Kong twice.  
#63785
A
have gone to
B
have been to
C
have been in
D
have gone in
 It’s reported that in the past 50 years around 80 percent of Beijing’s courtyard houses ______.
#63767
A
had wiped out
B
have wiped out 
C
have been wiped out 
D
had been wiped out
His uncle went abroad in 2010, and _______since.
#63782
A
has not been heard of
B
had not been heard of
C
had not heard of
D
has not heard of
— Alvin,are you coming with us?—I'd love to,but something unexpected ________.
#63769
A
has come up
B
was coming up
C
had come up
D
would come up