Mr. Ma， a famous mental (精神的) doctor from Beijing once said at an important meeting， Now many young students can have problems with their minds (思想). Some students become worried because they have to study very hard. Others have trouble getting on we

　　A.cheap

　　B.cheaper

　　C.cheapest

　　D.the cheapest

　　A.may； mustnt

　　B.must； may not

　　C.must； cant

　　D.can； may not

　　A. How interesting

　　B.How an interesting

　　C.What interesting

　　D. What an interesting

　　A.which

　　B.where

　　C.in which

　　D.from which

　　A. too much difficult

　　B.too more difficult

　　C.much too difficult

　　D.more too difficult