91. He is a t__________ musician for he could play music for people when he was only five.

90. The professor provided a _____________ (理论上的) framework for us.

89. She has already been a　　　　　　 　as the chief manager in this big corporation.

88. The police are questioning a fellow who was one of the ___________(目击者) of the accident.

87. Doing morning exercises every day is b________________ to our health.

　　 根据下列句子所给单词的首字母或中文含义，写出各单词的正确形式。(每空一词)

86. The shop owner bought them in q　　　　　　　 and they were a bit cheaper.