单选题 This dictionary is ______ useful tool for beginners.

单选题 This is ______ third time that I've been to Wenzhou, I want to be there ______ fourth time.

单选题 —Did you go to ______ concert last night? A wonderful one, isn't it? —Yes, and I have never attended ______ better concert.

单选题 It was ______ cold winter night and the moon was shining brightly across ______ night sky.

单选题 Though I didn't succeed this time, I would try ______ time.

单选题 Last Sunday he went to ______ Great Wall at ______ noon.

单选题 —There is ______ X - ray machine in the hall. —Well, it is used to check if people take dangerous things with them.

单选题 —What ______ fun it was to look around the Slender West Lake last week! —Yeah. It was quite ______ unforgettable experience.