With the rapid growth of population, the city _____ in all directions in the past five years.
#63791
A
spreads
B
has spread
C
spread
D
had spread
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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
-- I have got a headache. -- No wonder. You_________ on the math exercises too long.
#63776
A
work
B
are working
C
have been working
D
worked
--- I am surprised to hear that Sue and Paul have ______.---- So am I. They seemed very happy together when I last saw them.
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A
broken up
B
brought up
C
turned up
D
picked 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
Barrack Obama __________ President of the United States since 2010.
#63757
A
became a
B
has become a
C
has turned
D
has been