A. smaller B. small C. the smallest D. much small
A. noisier B. noisiest C. much noisier D. more noisiest
A. more exciting B. exciting C. most exciting D. excited
A. dirtier B. much dirty C. dirty D. dirtiest
A. older B. old C. oldest D. elder
A. on B. to C. with D. about
A. as B. than C. to D. over
A. have to B. has to C. should D. must
A. don’t have to B. must C. mustn’t D. have to
A. must B. have to C. don’t have to D. mustn’t