def titlecase(string, exceptions):
	words = string.lower().split(' ')
	new_words = []
	for word in words:
		if word in exceptions:
			new_words.append(word)
		else:
			new_words.append(word.capitalize())

	return ' '.join(new_words)

print(titlecase('the quick brown fox jumps over the lazy dog', ['jumps', 'the', 'over']))