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答案与解析：
87. take people’s sleeping quality into account / take people’s sleeping quality into consideration
解析：考点是词组take sth into account\consideration.
88. the field (where) we can cooperate
解析：考点是定语从句。
89. decided to quit the match
解析：考点是词组decide to do sth.
90. contact us at the following address
解析：考点是词组contact sb at some address.
91. if you are convenient
解析：考点是条件状语从句。
