Which dictionary is best?

Which dictionary is the best for students in high school? which is the best?还是 which is best? Which name is the best? which is the best answer? i like the dictionary the cover of which is red I have a Longman Dictionary of Contemporary English,which is I have five dictionaries among which Longman Dictionary is p Which is the best way to which is the best?的意思? which is Tom's best friend?为什么用which? 是Which dog is the best还是Which is the best dog which clothse,the new are best;which friends,the old is best