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。