It is fun _(climb) hills
It is fun _(climb) hills
It is _ difficlt for us to climb the mountains
We'll climb Qianling Hills if it next Sunday
they will climb the hills if it -----(not ,rain)tomorrow
It's a good time to climb hills中的It是不是形式主语
Tom found()interesting to climb hills为什么不能用it’s?
It's a good time to climb hills.(同义句)
It must be _____(fun) to climb mountain
___great fun it is
it is very fun
it's a good time to climb hills 可以等于it's a good time for cli
it is fun to look at the posters when I finish _ them A make