Tìm và sửa lỗi sai :
1.I always keep the window open so as to letting the fresh air in.
2.Lan tidied the bedrooms and cleaned the windows since yesterday.
3.We are very surprise that he won the first prize.
4.Da Lat is known like a city of pines,waterfalls and flowers.
letting->let
tided->has tidied
surprise->surprised
like->as