You can practice your intonation and pronunciation with these exercises:
INTONATION
PRONUNCIATION IN SLOW AND FAST SPEECH
PRONUNCIATION IN SLOW AND FAST SPEECH 2
CONSONANT CLUSTERS AT THE BEGINNING OF WORDS
CONSONANT CLUSTERS AT THE END OF WORDS
CONSONANT CLUSTERS WITHIN AND ACROSS WORDS
WORD STRESS AND PROMINENCE
WORD STRESS AND SUFFIXES h
WORD STRESS AND SUFFIXES 2
WORD STRESS AND SUFFIXES 3