People think “SOS” is the simplest and common to make, in time of danger or disaster.
You can’t use my bike _____ you return it to me by the weekend.
—By the way, Mary sends her love to you. —______.
Helen ____ go on the trip with us, but she isn’t quite sure yet.
Great changes have taken place in Cangnan. We’re sure Cangnan will be even_____ tomorrow.
Look out when crossing the road, _____ you may be hit by a car.