World No Smoking Day is ________ May 31. A. in B. on C. at
—We’ll have a hiking trip, but when shall we meet? —Let’s make it ___ half past eight ___ the morning of June 1.
— Where is my pen ? Have you seen ____? — Oh, sorry. I have taken ____ by mistake.
—Were you at home 7:00 last night? —Yes, I __ a shower at that time.
—Hello, Mike. Long time no see, Where are you? —Oh, not only my parent but also I __ Wuhan for a month.
Don’t discuss the problems with your partner unless you ___ to do so.