一Have you mended your bike,Bob?一Yes,I______it twenty minutes ago.   
#36854
A
have mended
B
mend
C
had mended
D
mended
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—It’s dangerous to swim here. Look at the sign!—Oh, I _______ it.
#36498
A
didn’t notice
B
don’t notice
C
hadn’t notice
D
haven’t notice
Mr. Wang told us that the moon ______ round the earth.
#39997
A
traveled
B
travels
C
traveling
D
travel
Look! What a clean room! Who _______it ?
#39852
A
has cleaned
B
is cleaning
C
will clean
D
cleaned