11.  We need spending a lot of time.

12.  People spend a lot of money, time and energy on commodities, Health and safety are consumers' interests.

13.  For example, if we eat the dirty food, we May get ill and have to spend a lot of money to see a doctor.

14.  So the user was injured, they spent lots of money, but did not get the full use of the commodities.

15.  If one often change their job, they will spend a lot of time on learning how to do a new job.

16.  But after class you should spend a lot of time reciting those numerous new words.( it is a revenge, or rewards?

17.  Since my major is English, I have to spend a lot of time to memorize the new words and expressions of this foreign language.

18.  Initially, I find I must spend a lot of time on preparing for the new lesson.

19.  They spend a lot of time and energy to take good care of you, to comfort you.

20.  In order to take care of their mother and to pay the medicine, the wife has to spend a lot of time with her mother after work, and the husband is busy doing part-time jobs during the night.