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9(+) They have done volunteer work.
10 (7) Has Peter collected clothes for street kids for two years?
11. (+) Sick children have to stay in the hospital all day
12. (+) He had to clean the classroom yesterday.
13. (+) Volunteer work has a good effect on all the students.
acfact
14. (+) Volunteer people will have wonderful feelings.
(?).
9(+) They have done volunteer work.
10 (7) Has Peter collected clothes for street kids for two years?
11. (+) Sick children have to stay in the hospital all day
12. (+) He had to clean the classroom yesterday.
13. (+) Volunteer work has a good effect on all the students.
acfact
14. (+) Volunteer people will have wonderful feelings.
(?).