World No Smoking Day is ________ May 31. A. in B. on C. at
They had _______ wonderful train ride to Chengdu before they went on to _______ Mount Emei by bus.
Very few people have to finish the work before going home, _________ ?
_______important news report it is!
It was nothing but 10 years of hard work that _______his success in business.
Excuse me, could you tell me________?