单选题  when the lights went off in the restaurant.

单选题  The manager suggested that the meeting ______ put off until next Monday.

单选题  It was in this factory ______ they met for the first time.

单选题  I can never forget the day ____ we worked together and the day ____ we spent together.

单选题  ______ his phone number, I couldn’t contact him yesterday.

单选题  Ten minutes ____ an hour when one is waiting for a phone call.

单选题  We were surprised at _____ the exam.

单选题  The project ______ he devoted five years of his life was finally completed last month.

单选题  The proposal ___ at the meeting now is of great importance to our department.