1)we are going to beijing ___ a school trip in the summer holiday.

问题描述:

1)we are going to beijing ___ a school trip in the summer holiday.
[for/to/at/with]
2)don't ___,tony.the dog won't bite you.
[afraid/be afraid/be afraid of/afraid of]
3)it's too cold on the top of the hill.let's ____.
[go up/go down/go out/go on]

CBB