一般地，一种商品价格变动，不仅影响该商品的需求量，也会影响相关商品的需求量。普通商品a和b互为替代品，在其他条件不变的情况下，a的价格变动对它们需求的影响，可用＿＿＿体现。
—Mike was rushed to hospital last night.Is he all right? —Really? But don’t worry！I________to the hospital and see him this afternoon.
—Your colleague’s spoken English is quite good，Amy. —No wonder，as she________in the USA for two years.
—What’s that noise，John? —Sorry，Linda.I forgot to tell you.The school library________.
Every year a flood of farmers arrive in Shenzhen for the moneymaking jobs they ________ before leaving their hometowns.
By the time Pierce comes back from the meeting，we________here for three hours.
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