You can go out, _________you promise to be back before 11 o’clock

We work together to achieve our common purpose: __________ world that is safer, cleaner and healthier than __________ one we are living in.

ering your income, you should be able to ______at least twenty dollars a week.

Sometimes, ___ we show our gratitude for a person is reflected in the kind of food we serve him or her

Frequent smoggy weather has set the alarm ringing; by no means can we develop economy _____ the environment.