There is/are a number of discussion

There is/are a number of discussion there is\are a number of people... There is a large number of还是there are a large number of There is/are a number of…… there is a large number of children还是there are a large numbe -What___ in the zoo?-There are a number of animals.A.is B.ar there are a l什么number of books there there be a number of……这里“be”用“is”还是“are”? There are a small number of people involved,possibly ______ A number of boys are playing football over there . There are a number of reasons behind my belief是什么意思 There are a number of more and more people.