单项选择题
A.Yes. you need B.Yes. ask C.Yes. please D.Let me see
Mathematics（）study or science of numbers.A.is B.are ...
单项选择题Mathematics（）study or science of numbers.
A.is B.are C.was D.were
Mary told me that she（）to the supermarket before coming...
单项选择题Mary told me that she（）to the supermarket before coming home
A.went B.had gone C.has gone D.goes
Many people watched the boys（）the mountain at that time...
单项选择题Many people watched the boys（）the mountain at that time.
A.climb B.climbing C.to climb D.climbed
