We laugh at jokes, but seldom __________ about how they work.
#81780
A
we think
B
think we
C
we do think
D
do we think
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Only when _____ in the afternoon _____ able to leave. 
#81505
A
the match was over; they were
B
was the match over; were they
C
was the match over; they were
D
the match was over; were they
What we have to admit is that never in the past thirty years __________ so greatly as today.
#80256
A
has China changed
B
China has changed
C
did China change
D
China had changed
Maybe you have been to many countries,but nowhere else    such a beautiful palace. 
#79517
A
can you find
B
you could find
C
you can find
D
could you find
_____ got on the train when it began to move.
#81175
A
No sooner had I
B
I had no sooner
C
Hardly had I
D
I hardly had