1，Before you take action,you should make careful preparations in a___.2,The visitors were so tired that they could hardly g____ on their legs.3,light ____(传播）faster than sound.
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1，(in) advance(提前）2，get3，goes
1，Before you take action,you should make careful preparations in a___.2,The visitors were so tired that they could hardly g____ on their legs.3,light ____(传播）faster than sound.
1，(in) advance(提前）2，get3，goes