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If ________, please pay a visit to me and have a further discussion of the issue.
#92250
A
you are convenient
B
it is convenient
C
it at your convenience
D
it is convenience
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To enjoy the scenery, Irene would rather spend long hours on the train _____ travel by air.
#92286
A
as
B
than
C
to
D
while
 In my bedroom, I have a small desk _____.
#94751
A
to write
B
writing
C
to write on
D
to write with
Scientists say it may be five or six years ______  it is possible to test this medicine on human patients.
#92459
A
before
B
after
C
since
D
when
—Do you mind my taking this seat?—_______________.
#93131
A
Yes，sit down please
B
No，of course not
C
Yes，take it please
D
No，you can’t take it
Rather than ________ on a crowded bus , he always prefers ________ a bicycle.
#92650
A
Riding;ride
B
ride;ride
C
ride; to ride
D
to ride; riding