Daily Mail of November 25th reported that American astronomers （天文学家）______aplanet that was most similar to the earth.
#56341
A
discovered
B
invented
C
found
D
noticed
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Jim couldn’t understand how the machine worked until his friends____ how to use it.
#61364
A
promised
B
explained
C
thought
D
heard
— Can you sing this song in English? — Of course I can. It ______ often ______ by us kids.
#53688
A
is; singing
B
does; sing
C
has; sung
D
is; sung