Chúc các cậu Giáng Sinh zui zẻ ạ, giúp tớ bài này nhé ! 6.We have not gone to school for 7 months. A.It is 7 months since we last went to school. B.It is 7 months since we go to school. C.It is 7 months when we have gone to school. D.It is 7 months since we have gone to school. 7.The pink dress is prettier, but it costs twice as much as the white one. A.The white dress is not as cheap as the pink one but it's prettier. B.The white dress isn't as pretty as the pink one, but it is cheaper. C.The pink dress is prettier and cheaper than the white one. D.The white dress costs as much as two pink pretty dresses. 8.I have many things to do, but I'll go to the carnival. A.Although I have many things to do, I'll go to the carnival. B.Although I have many things to do, but I'll go to the carnival. C.Although having many things to do, I'll go to the carnival. D.Because I have many things to do, I'll go to the carnival.