In( the north)( of) China,(this is) very cold and dry( in) winter.(括号里的哪个是错误的,请修改）

this is 改成 it is.通常用it 指代天气.
如,It is very warm in Hainan in winter.
It was quite windy yesterday.
(During )(the) holiday,(we) always have (good) time.（括号里的改错）
good 改成 a good.
have a good time,玩得很开心,过得很愉快 (Everything )(in) the room( are)( for) you.(括号里面的改错）are 改成is