Scientists study ___________ human brains work to make computer.
When I was a child, my teacher told me that the earth ______round the sun.
You will fail in the coming examination________ you work hard at your lessons.
---I must be back now. have a good trip.---_________.
______ Wang Mei, two girs in our class took part in 1,500-meter race and she won the first.
About 50 American ______ will come to this museum to enjoy those famous Chinese painting.