用适当的连词填空The school rules state that no child shall be allowed out of the school during the day,__________ accompanied by an adult.
______ the hope of…带着……的希望
The o______ of grain has doubled in China in the last ten years.
H______ is one of the biggest problems in some developing countries.
There were s______ to get out the burning car.
As is known to all, when heated, things will________(膨胀).
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