Pollution is a serious problem. Scientists have to _____ some good ways to save it.A. come up with B. come on C. come out
-- Let’s go to the KFC for lunch. ---No, eating too much junk food is an ____ habit.
---I can’t find my pen. ---___ you put it in your book.
---____ do you usually do on weekend? --- I usually play soccer.
---My son hardly ever eat vegetables ____ it’s good for his health. ---That is not a good habit.
---______ do you go shopping? ---- Twice a week.