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

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

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

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

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 I can never forget the day ______ we worked together and the day ______ we spent together.

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

单选题 Smoking cigarettes ______ not allowed in public places.