We will never forget those happiest days _______ we spent on the summer camp.

What about going out for ______ walk this weekend?—-Good idea.I love getting close to _____nature.

Do you know the man ________ visited the United States in February?–Yes. He is Chinese Vice-President Xi Jinping. He said it was his ____ visit to the United States.

We have lots of food _____ dinner. [ ]

Mr. Lee spent the final time of his life in writing after finding out that he ________ soon.