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【題目】A: The research on the new virus vaccine is challenging and demanding. Who do you think can do the job?

【題目】With no one , Mary felt lonely.

【題目】______ in thought, he failed to realize his mother’s approach.

【題目】What are the speakers mainly talking about?

【題目】Nurseries are the areas where plants are grown to be sold or ______ in other places.

【題目】You shouldn’t have been so rude to Dennis, ________you should apologize to him, I suppose.

【題目】Down __________ and hurt his leg.

【題目】—Chinese women's volleyball team proves that with hardships ______great success.