They ______Hong Kong twice.  
#63785
A
have gone to
B
have been to
C
have been in
D
have gone in
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I wonder why Jenny ____ us recently. We should have heard from her by now. 
#63792
A
hasn’t written
B
doesn’t write
C
won’t write
D
hadn’t written
Mary has __________ herself __________ for the party.
#63748
A
held; up
B
attended; to
C
done; up
D
turned; up
He complained that this was the third time he            of the changes of the meeting date.
#63781
A
would be informed
B
was informed
C
has been informed
D
has been informed
 Up to now, our society ________ with limited living space and a shortage of natural resources.
#63760
A
has been challenged
B
is being challenged
C
is challenging
D
has challenged