—Start out right away, ______________ you’ll miss the last train.—Don’t worry, but have you seen my ticket?

Before the sales start, I make a list of ______ my kids will need for the coming season.

_________ I picked up the receiver, I realized that someone had dialed the wrong number.

______ private cars are bringing us convenience, they also cause more traffic accidents and pollution.

Students should be encouraged to ______ their own opinions, ______ right or wrong.