Please use the proper form of the following words to fill in the blanks:

问题描述:

Please use the proper form of the following words to fill in the blanks:
good dangerous fast expensive safe poor little many
4) This machine costs only 5,000.It is ___________ than that one which is 8,000 but of similar functions.

less expensive
如果选项有low的话,还可以用lower.