At school, some students are active ______ some are shy, yet they can be good friends with one another.

–All the students in your class are in the photo ____ Susan. Why? --Aha, that is because she helped us take this photo.

---You look very healthy. ________do you exercise? -----I exercise three times a week. 

Granny often tells us _____ water in our daily life.

He had to retire(退休)early         poor health.