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3. extend extension extended

a. We won't be able to finish the test in one hour so I will _____________________ the

class period by fifteen minutes.

b. The course is normally done in three weeks; but we have a one week

______________________ this time because of the holidays.

c. The wire is _________________________as far as it will go; but it is stil1 too short.
d. The warm air of a warm front ________________________________wedge of cold air.

4. reduce reduction reduced

a. If we take a bus rather than a train, we can___________________________ the cost of

the trip.
b. The higher you go in the troposphere, the more the temperature

is________________________ .

c. There is no______________________________ in temperature in an inversion area.

d. when a low pressure system is in the area, the _______________________________

pressure allows the container in the aneroid barometer to expand and move the

indicator arm.

5. combine combination combined

a. Normally air from two different air masses won't _____________________________

unless the characteristics are very similar.

b. An occluded front wil1 produce a ________________________of warm-front and

cold-front conditions.
c. Driving is very dangerous when high speed is _____________________________with

wet roads.

d. The ___________________ of low cellings and continuous rain is a characteristic of a

warm front.