It's high time that the whole world（）together to fight with Covid-19.

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• It's from the Chien-an period that consciousness in literature began to buD.
• Perhaps it is worth trying to speak it, but it should not be laid down as an edict , and made immuneto change from below.
• It's helpful to read a lot of books about the topic before going to a lecture.
• It's suggested to give a quick review of the major research steps or experimental procedures before presenting the resul
• It's advisble for the speaker to hold something in hisher hand to reduce nervousness even when the object is irrelevant