Mrs. Smith locked both the front and the back doors before she went to bed______thatsomeone might steal into the house at night.

In order to buy a new car, you should at least ______ one hundred dollars a week.

Wehavetowaitforthebus,______?

OneoftheresponsibilitiesoftheCoastGuardistomakesurethatallships______followtrafficrulesinbusyharbors.

Those who change mobile phones too frequently will have to pay for being ______.