change them into active voice{轉active voice}

change them into active voice!

1)Traffic rules ought to be obeyed by every driver.
2)If you run across the road carelessly,you may be knocked down by a car.
3)Owing to bad weather,the picnic should be canceled by the teachers.
4)The work should be completed by the students by tomorrow.
5)These pills should not be taken more than twice a day.

Thanks:)