1. The prisoner ..... this way; there are no footprints at all.
needn't have escaped
may have escaped
had to escape
could have escaped
can't have escaped
2. My girlfriend said I ---- her anything for her birthday, but I think I ---- her some flowers at least or a nice perfume.
didn't need to buy / should buy
should have bought / must buy
had to buy / can't have bought
don't need to buy / don't have to buy
may not buy / may have bought
3. When an emergency vehicle is approaching with its lights and siren on, drivers ..... pull over and stop to get out of the way.
can't have moved
needn't have moved
must move
didn't need to move
4. Most advanced aircraft now ..... at supersonic speeds.
could have fly
shouldn't have fly
are able to fly
had to fly
were supposed to fly
5. You ..... down to about 30 kilometers an hour when you are driving through a school zone between dawn and dusk.
should have slowed
were supposed to live
may have slowed
had to slow
must slow
6. I ..... an office but I chose to work from home because everything I need is here.
must have rented
could have rented
may rent
might rent
7. As well as being a popular tourist site, Gran Canyon offers some of the most famous views in the country, .....?
was it
has it
hasn't it
doesn't it
didn't it
8. Scientists have found that people who are active at a moderate level experience a long list of health benefits and that physical activity .... vigorous.
is not used to being
has to be
needn't be
must be
9. You .... the locksmith to open the door for you last night before you tried to open the door yourself.