Now teenagers are very busy with their schoolwork and they have _____ time to do exercise.
---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.
They like to do the same things_____ their friends do.
If you have a toothache, you should go to see a______.
I don’t like math because it is _____.