—Why does the lake smell terrible?—Because large quantities of water______.          
#101560
A
have polluted
B
is being polluted
C
has been polluted
D
have been polluted
 ------Why do you turn back?------ Oh, the bridge ahead_______.   
#101562
A
is being repaired
B
is repairing
C
is repaired
D
is being repairing
------Tom is never late for work. Why is he absent today?------ Something _______ to him.
#101563
A
must have happened
B
can have happened
C
must happen
D
can happen
Tony was very unhappy for ______ to the party. 
#101565
A
having not been invited
B
not having invited
C
having not invited
D
not having been invited
____ to hospital in time, the wounded soldiers were saved at last. 
#101566
A
Taken
B
Taking
C
Having taken
D
Being taken
The ticket       two people to the palace ball.
#101571
A
permits
B
admits
C
promises
D
awards
By the time you finish the book, you _______________ more about Chinese history.
#101573
A
will learn
B
have learnt
C
will have learnt
D
are learning
--- Do you love teaching, Miss He?--- I fell in love with teaching in 2000. I ________ for twelve years by this summer.
#101574
A
will teach
B
would have taught
C
has been teaching
D
will have been teaching
---Remember how we met for the first time, Dick?---Of course I do. You _________ to the teachers' office hurriedly and ___________ me.
#101575
A
had walked; weren't noticing
B
were walking; didn't notice
C
had been walking; noticed
D
walked; had noticed
A lot of attention ______ to greenhouse gas emission. Look at those environmental posters.
#101577
A
is paying
B
is being paid
C
has paid
D
had been paid
A few minutes earlier, and you would have seen the NBA star. But you ________.
#101579
A
won't come
B
don't come
C
didn't come
D
haven't come
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