I had trouble (spell) _________ the difficult words when I first started learning French. (固定用法)
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Make sure that the new equipment (install) _________ in a safe manner. (被动语态)
As a police officer, you are trained to stay calm even in extremely (danger) _________ situations. (词形转换)
It is said that Abersoch is one of the (good) ________ beaches in the UK. (形容词最高级)
We make every effort to ensure that our transaction process is safe and that your (person) _________ information is secure. (词形转换)