An A4 sized panel ( 太阳能板 ) put onto the back of a jacket costs __________ US$15. It could __________ a cellphone during a summer walk.
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The world ’ s smallest baby, a __________ girl weighed just 24 grams when she was born .
I don't know_________.
—You look very pale. You __________ very tired. — I didn ’ t sleep at all last night.
America is an __________ country. You can hear __________ everywhere.