---Is this book____?---No, it isn’t. _____is on the desk.
If your father ___ in a hurry, he will be late.
When you get on a bus, the conductor will usually warn you ___ a thief.
It’s easy ___ because the bicycle needs ___ space.
If people obey the rules, there will be ___ traffic jams and accidents.
She is afraid of ___ out alone and she is also afraid ___ strangers.