is还是are a lot of balls

is还是are a lot of balls There are a lot of flowers 对吗还是is a lot of前面用threre is还是there are a lot of 前用is还是 are there a lot of meat中间填is还是are There( ) a lot of trees.填is还是are a lot of 前加is还是are /lots of 前加 is 还是are 是there are a lot of people、还是there is a lot of people? is a lot of rain还是are a lot of rain there is a lot of fruit还是there are a lot of fruit 应该是There are a lot of……还是There is a lot of…… 是 there is a lot of people 对还是 there are a lot of people 对