Wǒmen bìxū zuòhǎo chōngfèn de zhǔnbèi yìngduì gèzhǒng qíngkuàng.
We must make full preparations to handle every kind of situation.
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作 and 做 are often interchangeable here, but 作 is preferred in formal/written contexts. 作好准备 is a standard fixed pattern; you can also insert modifiers: 作好充分准备 ('make full preparations').
