（只差仔细阅读了 会尽快补上）

翻译
　 87.___________________(为了确保他参加会议)，I called him up in advance.

　　88.The significant museum________________(据说建成于)about a hundred years ago.

　　89.There would be no life on earth ____________________ (没有地球独特的环境)。

　　90.______________________________(给游客印象最深的)was the friendliness and warmth of the local people.

　　91.They requested that ___________________________ (我借的书还回图书馆) by next Friday.