When you’ve finished school, don’t forget to come back to visit your school, ______?

Don’t ____ too late , or you will feel tired in class. —I won’t , mum. Good night.

He likes tea and ______. [ ]

Why do you often collect garbage? —I collect garbage ______ protect the environment.

Many social workers went to Ya’an to help clean water and food to local people to reduce their pain from the earthquake.