it's sometimes ____that ufos have been seen high up in the sky.空里应该填什么

It's that life sometimes just It's sometimes called _____(recycle) material. IT'S NICE SOMETIMES中文什么意思 sometimes it's a_____dangerous,but it's _____an exciting job. but it rains sometimes 为什么没有系动词but it's rains sometimes 可以么 It's a kind of fruit .It's round.Sometimes it's green,sometimes it's red.It's___打一水果_ 翻译,it's sometimes hard tounderstand American and British accents Oh,sometimes it's like this instead,为什么呢? Sometimes,it”s difficult to get off有错吗 I know it's hard sometimes什么意思? sometimes it s better to bea bachelor是什么意思 You can download something important,sometimes it's for free. sometimes it's ___to find a best friend.And sometimes you can___a littie lonely. 英语翻译It's sometimes warm and another times cold.It's sometimes warm and at other times cold . It's just because we sometimes are too smart.翻It's just because we sometimes are too smart.翻译 Sometimes,it's not what you say that matters,it's what you don't. it’s sometimes dangerous to go alone.But it’s very interesting怎么翻译 Taste it.It's sweet.Touch it.It's hard and rough.Sometimes it's a rectangle.Sometimes it's a circle.You can eat it when you are hungry.这是什么东西?