Question

为了节约时间，他们决定开线上会议。

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Answer

(In order) to save time. they decide(d) to have an online meeting/have a meeting online.

【解析】

in order to do sth或to do sth.意为“为了做某事”，decide to do sth意为“决定做某事”，save time节约时间，have an online meetinghuo have a meeting online开线上会议。根据汉语可知句子用一般现在时或一般过去时均可，句子主语为they，谓语为decide或decided。故填：(In order) to save time. they decide(d) to have an online meeting/have a meeting online.